If a charged particle kept at rest experiences an electromagnetic force,

(a)	the electric field must not be zero
(b)	the magnetic field must not be zero
(c)	the electric field may or may not be zero
(d)	the magnetic field may or may not be zero

Choose the correct option: 
1. (a), (b)
2. (b), (c)
3. (c), (d)
4. (a), (d)

If a charged particle projected in a gravity-free room deflects,

(a) there must be an electric field
(b) there must be a magnetic field
(c) both fields cannot be zero
(d) both fields can be nonzero

Choose the correct option 

1. (a), (b)

2. (b), (c)

3. (c), (d)

4. (a), (d)

A charged particle moves in a gravity-free space without change in velocity. Which of the following is/are possible?

Choose the correct option:

A charged particle moves along a circle under the action of possible constant electric and magnetic fields. Which of the following are possible?

Choose the correct option:
1. (a), (b) 
2. (b) only
3. (c), (d) 
4. (a), (d) 

A charged particle goes undeflected in a region containing electric and magnetic field. It is possible that 

(a)  \(\overrightarrow{\mathrm{E}}\|\overrightarrow{\mathrm{B}} \quad \overrightarrow{\mathrm{v}}\| \overrightarrow{\mathrm{E}}\)
(b)  \(\overrightarrow{\mathrm{E}}\) is not parallel to   \(\overrightarrow{\mathrm{B}}\)
(c)   \(\overrightarrow{\mathrm{v}} \| \overrightarrow{\mathrm{B}}\) but   \(\overrightarrow{\mathrm{E}}\) is not parallel to  \(\overrightarrow{\mathrm{B}}\)
(d)   \(\overrightarrow{\mathrm{E}} \| \overrightarrow{\mathrm{B}}\)  but   \(\overrightarrow{\mathrm{v}}\) is not parallel to \(\overrightarrow{\mathrm{E}}\)

Choose the correct option 

1. (a), (b)

2. (b), (c)

3. (c), (d)

4. (a), (d)

If a charged particle goes unaccelerated in a region containing electric and magnetic fields,

(a)   \(\overrightarrow{\mathrm{E}}\)  must be perpendicular to  \(\overrightarrow{\mathrm{B}}\)
(b)  \(\overrightarrow{\mathrm{v}}\)  must be perpendicular to  \(\overrightarrow{\mathrm{E}}\)
(c)   \(\overrightarrow{\mathrm{v}}\) must be perpendicular to  \(\overrightarrow{\mathrm{B}}\)
(d)  E must be equal to vB.

Choose the correct option 

1. (a), (b)

2. (b), (c)

3. (c), (d)

4. (a), (d)

Two ions have equal masses but one is singly-ionized and the other is doubly-ionized. They are projected from the same place in a uniform magnetic field with the same velocity perpendicular to the field.
(a) Both ions will go along circles of equal radii.
(b) The circle described by the singly-ionized charge will have a radius double that of the other circle.
(c) The two circles do not touch each other.
(d) The two circles touch each other.
Choose the correct option: 

1. (a), (b)
2. (b), (c)
3. (b), (d)
4. (a), (d)

An electron is moving along the positive x-axis. You want to apply a magnetic field for a short time so that the electron may reverse its direction and move parallel to the negative x-axis. This can be done by applying the magnetic field along
(a) y-axis
(b) z-axis
(c) y-axis only
(d) z-axis only
Choose the correct option:
1. (a), (b)
2. (b), (c)
3. (c), (d)
4. (a), (d)

Let \(\overrightarrow{\mathrm{E}}\)and \(\overrightarrow{\mathrm{B}}\)denote electric and magnetic fields in a frame S and \(\overrightarrow{\mathrm{E}}\) and \(\overrightarrow{\mathrm{B}}\) in another frame S' moving with respect to S at a velocity  \(\overrightarrow{\mathrm{v}}\) Two of the following are wrong. Identify them.

(a) B_y’ = B_y +  \(\frac{\mathrm{vE}_{\mathrm{z}}}{\mathrm{c}^{2}}\)
(b) E_y’ = E_y –  \(\frac{\mathrm{vB}_{\mathrm{z}}}{\mathrm{c}^{2}}\)
(c) B’_y = B_y + vE_z
(d) E’_y = E_y + vB_z

Choose the correct option

1. (a), (b)

2. (b), (c)

3. (c), (d)

4. (a), (d)

A vertical wire carries a current in an upward direction. An electron beam sent horizontally towards the wire will be deflected 

1.   towards right

2.   towards left 

3.   upwards

4.   downwards