Question 1 : <span class="wysiwyg-font-size-medium"><span class="wysiwyg-font-size-medium"><p class="wysiwyg-text-align-left">The magnetic force required to demagnetise the material is</p>
Question 2 :
A long solenoid has 1000 turns per meter and carries a current of 1 A. It has a soft Iron core of$$ u_{r}= 1000 $$. The core is heated beyond the Curie temperature,$$ T_{e^{-}} $$
Question 3 :
If a magnet is suspended at angle $${ 30 }^{ o }$$ to the magnet meridian, the dip of needle makes angle of $${ 45 }^{ o }$$ with the horizontal, the real dip is
Question 4 :
At a place, the angle of dip is 30$$^{0}$$. If the horizontal component of earth's field is $$B_{H}$$, then the net field intensity at the place will be :<br/>
Question 5 :
Statement-1: The core of the transformer is laminated to avoid loss of energy.<br>Statement-2: A laminated metal sheet placed in a changing magnetic field has lower eddy current.
Question 6 :
A capacitor having capacity of $$2.0\mu F$$ is charged to $$200\ V$$ and then the plates of the capacitors are connected to a resistance wire. The heat produced in joule will be :
Question 7 :
$$R=100\ k\Omega$$ and $$C=1\ \mu F$$ are connected in a series with a $$12\ volt$$ battery. What is the maximum energy stored in the capacitor:
Question 8 :
Two small identical metal balls A and B radius r are placed apart The distance between centre of balls is$$\displaystyle a_{0}$$ The net potential of ball A is$$\displaystyle V_{1}$$ and that of B is$$\displaystyle V_{2}$$ Let$$\displaystyle q_{1}$$ and$$\displaystyle q_{2}$$ are the charges on balls A and B respectively Then the charge on A and B are ($$\displaystyle \left ( given\: r< < {a_{0}} \right )$$)
Question 9 :
The relative permittivity of water is 81. If $$\varepsilon_0$$ and $$\varepsilon$$ are permittivities of vaccum and water respectively Then:
Question 12 :
Assertion(A): An inductor in a D.C. circuit opposes both a steady current and a changing current.Reason(R): Induced emf is generated only when the flux linked with the inductor remains unchanged.<br/>
Question 13 :
The north pole of long horizontal bar magnet is carried towards a vertical conducting plane. The direction of induced current in the conducting plane will be
Question 14 :
If a Bismuth rod is introduced in the air coil as shown then current in the coil
Question 15 :
The magnitude of the earth's magnetic field at the north pole is $${B}_{0}$$. A horizontal conductor of length $$l$$ moves with a velocity $$v$$. The direction of $$v$$ is perpendicular to the conductor. The induced emf is
Question 16 :
A solenoid have the self inductance 2H. It length of the solenoid is doubled having turn density and area constant then new self inductance is going to be the:-
Question 17 :
The coil of the moving coil galvanometer is wound over an aluminium frame<br/>
Question 18 :
A wire of length $$L$$ meters carrying a current $$I$$ amperes is bent in the form of a circle. The magnitude of the magnetic moment is:
Question 19 :
A long solenoid has a radius $$a$$ and number of turns per unit length is $$n$$. If it carries a current $$i$$, then the magnetic field on its axis is directly proportional to
Question 22 :
Two electric dipoles of dipole moment $$2 \space cm$$ and $$4 \space cm$$ respectively are kept inside a cube of side $$'a' \space m$$. Total electric flux linked with the cube is (in SI units)
Question 23 :
If<b> </b>the force between two charged objects separated by a distance d is to be left unchanged even though the charge on one of the objects is halved, keeping other the same, the new distance of separation becomes :
Question 24 :
Four positive charges $$(2\sqrt 2 - 1)$$ Q are arranged at the four corner of a square. Another charge q is placed at the centre of the square. Resulting force acting on each corner charge is zero if q is :
Question 25 :
Electric flux through a surface of area $$100\ m^{2}$$ lying in the xy plane is (in V-m) if $$\vec{E}=\hat{i}+\sqrt{2}\hat{j}+\sqrt{3\hat{k}}$$<br/>
Question 26 :
In the 5 band color resistor,which color bands are considered as significant digits?
Question 28 :
A flashlight cell of emf. $$1.5\ volt$$gives $$15$$ampere current when connected to an ammeter of resistance $$0.04\Omega$$. The internal resistance of the cell will be<br>
Question 29 :
Two electric bulbs have ratings respectively of $$25W, 220 V$$ and $$100 W, 220 V$$. If the bulbs are connected in series with a supply of $$440\ V$$, which bulb will fuse?
Question 30 :
Three resistors are connected in parallel across a potential difference and a current $$I$$ passes through it, the resistance values are such that $$R_1 < R_2 < R_3$$, then the ratio of branch currents in the same order is:
Question 31 :
A transformer steps up an $$AC$$supply from$$220 V$$to$$2200V$$. If the secondary coil of the transformer has$$2000$$turns, the number of turns in its primary coil will be:
Question 32 :
Whenthe values of inductance and capacitance in an $$L-C$$ circuit are $$0.5\ H$$ and $$8\ \mu$$F respectively then currentinthe circuit is maximum. The angular frequency ofalternatinge.m.f. applied in the circuit will be
Question 34 : <p class="wysiwyg-text-align-justify"><span class="wysiwyg-font-size-medium"><span class="wysiwyg-font-size-small">A series LCR circuit is tuned to resonance. If the angular frequency of the applied AC voltage at resonance is <span class="wysiwyg-font-size-small">$$\omega $$<span class="wysiwyg-font-size-small">, the impedance of the circuit then is:</p>
Question 35 :
A choke coil and capacitor are connected in series and the current through the combination is maximum for AC of frequency n. If they are connected in parallel, at what frequency is the current through the combination minimum?<br>
