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1, A capacitor is charged by a battery. The (a) over a lull cycle the capacitor C dons not, battery is removed and another identical consume any energy fom the vollage scurcy, uncharged capacitor is connected in (b) current Hf) is. on phase with voltage Vi, parallel. The total electrostatic energy of {c) currant Itt) tends vorlage Vin by Veo, resulting system INEET 2017] {c) current if), lags voltage V(t) by 90, (a) incteases by a factor of 4 5. An clectric dipole is placed at an angle of, (b) decreases by a factor of 2 40° with un electric field intensity 2x 19°, , {c) remains the same, , > sriences a torque equal to 4 Ny,, (G) increases by a actor of 2 NIC, I experie, , ‘The charge on the dipole, if the dipole, , 2. Suppose the charge of a proton and an length is 2. cm, is INEET 2016), electron differ slightly. One of them is -e (a) BmC fb) 2m (c} SMC) THC, and the other is (e + Ae). If the net of, electrostatic force and gravitational force, between two hydragen atoms placed ata, distance d (much greater than atomic size), , 6. A parallel-plate capacitor of area A, plate, Smee in d and capacitance C is filled, with four dielectric materials having, , , , , , , , , , , , , , : . dielectric constants k pkaky and ky as, a an oe - wee shown in the figure below. Ifa single, ydrogen, m), = 1. NeET obTaT dielectric material is to - used —_ the, - i ad is capacitor, then, aio oC 1 10-7 toc same capacitance C in th, ae shells one its dielectric constant k is given by, 3. A capacitor of 2uF is charged as shown in INEET 2016}, the figure. When the switch S is turned to Aa As AIa, position 2, the percentage of its stored T, energy dissipated is INEET 2016] hy ky sy II ve, 1 @ g : i, * . | is, Vor nF The A, fa) Kak + ky + hy + Shy, l {b) Kas (hy + Me + Ay) + 2K,, (a) 20% (0) 75% (ce) 80% = (s}. 0% () 2e—3_ 4.1, 4. A small signal voltage V(t) = Vy sin ot is fi M + *s + ks %, lied across an ideal capacitor C (ae io, = ” INEET 2016] Koh ky ky ky, , ae

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ie, , parallel plate air capacitor of Capacitance, , * ig connected to a cal, ci Jof emf V and then, , disconnected from it. A dialoctrie, dielectric constant K, which clay, the air g9p of the capacitor, is now insert 1, in it, Which of the following is Imoocect, , ICASE AIPMT 2, a) The potential difference betwee eral, # decreases K times ea, , The energy st i, (0) eines Gy Stored in the capacitor decreases, , {c) The change in energy stored is 5ov ( to, 27 \k” ), , (@) The charge on the capacitor is not conserved, , g. The electric field in a certain region is, , acting radially outward and is g, , BeArA charge contained in : ae of, radius ‘a’ centred at the origin of the field!, will be ih by [CBSE AIPMT 2015], {a) Ame Aa® (b) Aega® —(c) Ane Aa” (cd) eyAa, , 9, In the given figure, a diode D is connected, , to an external resistance Rl =, e.m.f of 3.5 V. If the barrier in ", developed across the diode is 0.5 V, the, current in the circuit will be, , {CBSE AIPMT 2015], , D100, ; me, , , , , , , , L 4 1| —___—, 35V, , {a)30 mA (b) 40 mA (c) 20mA (d) 35 MA, , 10. If potential (in volts) in a region is, , expressed as V (x, v, 2) = Gxy ~ y +2y2, the, , electric field (in N/C) al point (1, 1, 0) is, {CBSE AIPMT 2015), , (b) - (61 + 5] + 2k), , (a) - (31 + 5] + 3h) i, (d) - (61 + 9) +k), , ()-@i+3)+k), , 11. A parallel plate air capacitor has capacity, , C, distance of separation between plates is, , d and potential difference V is applied, , between the plates. Force of attraction, , between the plates of the parallel plate air, i, , , , capacitor is CBSE AIPMT 2015], ctv? cv? cv? cv?, (a) od (b) od (c) (d) 2a?, , 12. Two thin dielectric slabs of dinlectite, , constants K, and K, (Ky « K,) ore ineerted, betwoen plates of u parallel plate enpacitor,, as shown In the figure., , " a, , ‘, ‘, ‘, ', ', +, +, ‘, , Ky Ky, , The variation of electric field E between, the plates with distance das measured, , from plate P is correctly shown by, {CBSE AIPMT 2014], , ie, , , , , , (ce) (¢), , , , , , aq, +, , 0, , 13. A conducting sphere of radius f is given a, , charge Q. The electric potential and the, electric field at the centre of the sphere, , , , respectively are [CBSE AIPMT 2014), Q oO, (a) zero and aaa (b) iF and zero, QO Q, a Both, (c) a and im (d) are 26r0, , 14. Ina region, the potential is represented by, , V(x, y. 2) =6x- Bxy - By + Gyz, where Vis, in volts and x, y, z are in metres. The, electric force experienced by a charge of 2, C situated at point (1, 1, 1) is, t, , CBSE AIPMT 2014], (a) 6V5N (b) 30.N, (c) 24N (d) 4/35 N

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15. A,B and C are three points in a uniform, , electric field. The electric potential is, (NEET 2013], , , , 8 =, ++, eC, (a) maximum at A, (0) maximum at 8, , (c) maximum at C, (d) same at all the three points A, BandC, , 16. Two pith balls carrying equal charges are, suspended from a common point by strings, of equal length, the equilibrium separation, between them is r. Now, the strings are, rigidly clamped at half the height. The, equilibrium separation between the balls, , , , , , now becomes INEET 2013), T, , a(z J (4), , o(%) aff), , 17. An electric dipole of moment p is placed in, , an electric field of intensity £. The dipole, acquires a position such that the axis of the, dipole makes an angle @ with the direction, of the field. Assuming that the potential, energy of the dipole to be zero when, @=90°, the torque and the potential energy, , of the dipole will respectively be, (CBSE AIPMT 2012], , (b) pE sin@, - 2 pE cos®, , (a) pE sin@, - pE cosé, {d) pE cos®, - pE sin®, , (c) pE sin@, 2 pEcos®, 18. Four point charges -Q, - q, 2q and 2Q are, placed, one at each corner of the square., , ‘The relation between Q and q for which the, , potential at the centre of the square is zero,, is [CBSE AIPMT 2012], , (@Q=-¢q ()0=-1 @O<q (O=+, qg 9, , 19, What is the flux through a cube of side ait, a point charge of q is at one of its corner?, , ICBSE AIPMT 201), 2q q g q, a) (6) —— (c= (¢), ' & 85 & 2e ee?, , 20. A parallel plate condenser has a uniform, electric field E (V/m) in the space between, the plates. If the distance between the, plates is d(m) and area of each plate is, ‘A(m?), the energy (joule) stored in the, condenser is [CBSE AIPMT 2011), , (a) Lege? (0) egBAd (c) Ftcb*Ad (8) E*Ad Ie, 21. A charge Q is enclosed by a Gaussian, , spherical surface of radius A. If the radius, is doubled, then the outward electric flux, , will [CBSE AIPMT 2011], (a) be reduced to half —_(b) remain the same, {c) be doubled (d) increase four times, , 22, Four electric charges +g, + g,— q and -q are, placed at the corners of a square of side 2 L, (sec figure). The electric potential at point A,, mid-way between the two charges, , +qand +q is [CBSE AIPMT 2011], , +q =9, , t, , t, , Ha, , t, , a, , t, , +q<— 2L—> -9, , 124/441) yt 2fy-4, @ 2 (1+) Oa a1 ), (c) zero (a) 1 221+ V8), 4ne, L, , 23. Two positive ions, each carrying a charge q,, are separated by a distance d. If F is the, force of repulsion between the ions, the, number of electrons missing from each ion, will be (¢ being the charge on an electron), , (CBSE AIPMT 2010), 2 2, (a) safe ) — e, lane.Fo? 2, (0 eee (eee

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24. The clectric field part of an, Clectromagnetic wave in a medium is, topresented by Li, = 0;, , (2x x 10° ma, , E,=2.5 N con, C m, , , , ~, rad r, -(x x10°* ee } he = 0. The wave is, , ICHSE AIPM 209, (a) moving along y-direction with frequency, 2n * 10" Hz and wavelength 200 m, (b) moving along z-direction vath frequency 1g! Hz, and wavelength 100m, (c) moving along x-direction with frequency 10% He, and wavelength 200 m, (d) moving along ~ x-direction with frequency, 10° Hz and wavelength 200 m, , 25, In an AC circuit the emf (V) and the, , current (i) al any instant are given, respectively by, , V=V, sin wl, i =i, sin (wt - 9), The average power in the circuit over one, , cycle of AC is ICBSE AIPMT 2008), VA Voto os, , a) 2.2 ib) 2-2, , ( a (b) 2 sing, , (c) — Cos > (0) Vtg, , 26. The velocity of electromagnetic radiation, in a medium of permittivity e, and, permeability py is given by, , ICBSE AIPMT 2008), ta) |8 —O) fagey (ce) pt ay Ho, Uo vio fo \&, , 27. A transformer is used to light a 100 W and, 110 V lamp from a 220 V mains. If the, main current is 0.5 A, the efficiency of the, transformer is approximately, , ICBSE AIPMT 2007], (a) 30% {b) 50% (c) 90% (d) 10%, , 28. The primary and secondary coils of a, transformer have 50 and 1500 turns, respectively, If the magnetic flux 6 linked, with the primary coil is given by, = 0y + 40, where ois in weber, f is time in, second and 6, is a constant, the output, voltage across the secondary coil is, (CBSE AIPMT 2007}, , {c)220V (d) 30V, , (a) 90V (b) 120, , , , > sy 0105 4 ~ = nea, , at is the value of inductances Ee, . * ich the current is maximum j ,, p * : circuit with = 10 pF and —, y 210005"? (CBSE Apu 2967), (a) 190 mH, , 1K, e Cannot be calouated ries Rs irmue, (e) 10 mH, acoil of inductive reactance 31 Q has a, 0. resistance of 622. It is placed in series with, condenser of Capacilative reactance 25 0., The combination is connected to an AC, source of 110 V. The power factor of the, circuit is ICBSE AIPMT 2006), ose (0) 084 (BD (033, e of a transformer is laminated, i. cao (CBSE AIPM 2006], (a) eneray losses Cue to eddy orrents may De, , mnmsed, , the wean of the tanstormer may be reouced, {c) rusting of the core may De preveraec, , (g) rat cf voltage in pamary anc secondary Ty, , be increasec, 52. If hy, hy and 2, represent the waveleng, , risible light, X-rays and microwaves, S ectively then [CBSE AIPMT 2005], , Ie 2 ey PI (0) h, > he oh,, " x : x ei (4, >4.> 7, , 33. Ina circuit. L.C and Rare connected, series with an alternating, , ency f., by 45°. The value, , (p), , (8) eet + Fi :, 1 (aR), (sam -Ai xxi - Fi, , are not, 34, Which of the follow ring 28 cast AIPMT 2003], , electromagnetic WAYS aa: rays, (a) Bays, (c) X-rays, , 35. For a series L, , ver, CR circuit, the pow, CBSE, resonance is 7

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56., , 37., , 38., , 40., , For a transparent mediur, meability and nerwititig, —, p.o and 1.44 respectively. Thy, in this medium would be, (a) 25x 10° ms (b) 3x 198, ms, (c)2.08 » 10° mis (4) 432 «10° mys, , A sphere encloses an electric di, , ~ ipole, charge * 3» 10°° C. What is ce eis, flux across the sphere? electric, fa)- 310° NMC (by zero, (co) 3x 10° Nem7/C, , YR, and ©, are, © velocity af light, , (9) 610° Nem?, , Two identical, capacitors C, and, Cc, 0 equal, capacitance are, connected as, shown in the, circuit. Terminals a, and bot the key & are connected to charge, capacitor C, using battery of emf ¥ volt, Now, disconnecting a and 6 the terminals b, and © are connected. Due to this, what will be, the percentage loss of energy?, , ia) 75% (5) 0% {c) 50% {0) 25%, , The main scale of a vernier calliper has, divisions‘cm. 1 divisions of the vernier scale, coincide with (7 =1) divisions of main scale., The Jeast count of the vernier callipers is :, , 1 1, @rnn-n a ll, 1 1, cj >= om ——, ( 1a ans 7, , A person travelling ina straight line moves, with a constant velocity ¥, for certain, distance ‘x’ and with a constant velocity ¥,, for next equal distance. The average velocity, vis given by the relation, , 41., , aa Zates, voy Ms vo Ve, a5 ee (ayy = faite, , Assuming that the gravitational potential, energy of an object at infinity is zero, the, change in potential energy (final ~ initial) of, an object of mass am, when taken toa height, jrfrom the surface af earth (of radius R) is, given by,, , Gldm Ghd Glam, ay - GIA gy GM cy gh (3) 5-7,, @-F Maan © Reh, ig of water, of volume | ca? at 100°C is, , converted into steam at same temperature, under normal atmospheric pressure, , =(=1~ 10° Pa). The volume of steam, equals 1671 cm’. Hf the specific latent heat of, vaporisation of water js 2256 Jy, the change, in internal energy is, (a) 2423.4 (b) 20894, , formed, , tc) 1675 = (0) 22565, , Angular width of the central maxima in the, Fraunhofler diffraction for 7 = 6000 A is BpWhen the same slit is iuminated by another, monochromatic light, the angular width, decreases by 30%, The wavelength of this, light is, , (a) 18004 (bb) 42004 (c) 6000 (a) 4204, , The work function of a photosensitive, material is 4.0 eV, This longest wavelength of, light that can cause photon emission from, the substance is (approximately |, , fa) 3100 nm (b) SB nm, {c) 31 am (4) 310 nen, A proton and an @-part icle are accelerated, , from rest to the same energy. The de-Broglie, wavelengths 7, and #4, are in the ratio, (a) 2.1 fb) 1.1 (co) x2 1 (cy 401, , Awmeourare