Question 1 :
The magnetic field due to a circular wire at its center is:
Question 2 :
When a charged particle is acted on only by a magnetic force, its:
Question 3 :
An eleclron is travelling horizontallty towards east. A magnetic field in vertically downward (inside the plane of paper) direction exerts a force on the electron along
Question 4 :
If a charged particle is projected perpendicular to a uniform magnetic field, then<br/>a) it revolves in circular path<br/>b) its K.E. remains constant<br/>c) its momentum remains constant<br/>d) its path is spiral<br/><br/>
Question 5 :
A circular coil of radius $R$ carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a distance $r$ from the centre of the coil, such that $r > > R$, varies as
Question 6 :
A charged particle is projected perpendicular to a uniform magnetic field. Arrange the following in correct order of occurrence : <br>A) The direction of momentum of the particle changes<br>B) The particle experiences a force<br>C) The particle revolves in a circular path<br>
Question 7 :
Imagine that you are seated in a room and there is a uniform magnetic field pointing vertically downwards in it . At the center of the room an electron is projected horizontally with a certain speed. The path of the electron in this field are:<br/>
Question 8 :
If electron velocity is $2\hat{i} + 3\hat{j}$ and it is subjected to magnetic field of $4\hat{k},$ then its
Question 9 :
Identify the condition in which charged particle will experience the maximum force:<br/>
Question 10 :
A current carrying coil is placed with its plane in the magnetic meridian of the earth. When seen from the east side a clockwise current is set up in the coil.The magnetic field at its centre will be directed towards <br/>
Question 11 :
A proton of energy $8eV$ is moving in a circular path in a uniform magnetic field. The energy of an alpha particle moving in the same magnetic field and along the same path will be <br/>
Question 13 :
An unknown particle is being studied in a magnetic field of variable intensity and direction. When the magnetic field is turned off, the particle is observed to move toward the earth. When the magnetic field is turned on, the particle is observed to continue to move toward the earth, no matter the strength or the direction of the magnetic field. Which of the particles listed below is most likely the unknown particle?
Question 14 :
An electron accelerated through a potential difference V passes through a uniform transverse magnetic field and experiences a force F. If the accelerating potential is increased to 2V, the electron in the same magnetic field will experience a force<br>
Question 15 :
A proton and an electron both moving with the same velocity $v$ enter into a region of magnetic field directed perpendicular to the velocity of the particles. They will now move in circular orbits such that
Question 16 :
A charged particle moves through a magnetic field perpendicular to its direction, then
Question 17 :
A photon of energy E ejects a photoelectron from a metal surface whose work function is $W_0.$ If this electron enters into a uniform magnetic field of induction B in a direction perpendicular to the field and describes a circular path of radius r, then the radius r is given by (in the usual notation)
Question 18 :
An electron revolves with frequency $6.6\times 10^{15} r.p.s. around nucleus in circular orbit of radius $0.53\overset {\circ}{A}$ of hydrogen atom, then magnetic field produced at centre of orbit is
Question 19 :
Two circular coils A and B of radius $\dfrac { 5 }{ \sqrt { 2 }  } $ cm and 5 cm carry currents 5 A and $5\sqrt { 2 } A$,respectively. The plane of B is perpendicular to plane of A and thier centres coincide.Magnetic field at the centres is<br/>
Question 20 :
<span>A current flows in a circular arc of wire whose <span>radius is $R$, which subtends an angle $\cfrac{3\pi}{2}$ radian at its centre. The magnetic field $B$ at the centre is</span></span>
