If a charged particle at rest experiences no electromagnetic force then,
(a) | the electric field must be zero. |
(b) | the magnetic field must be zero. |
(c) | the electric field may or may not be zero. |
(d) | the magnetic field may or may not be zero. |
(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?
a. | \(E=0,~B=0\) |
b. | \(E=0,~B\neq0\) |
c. | \(E\neq0,~B=0\) |
d. | \(E\neq0,~B\neq0\) |
Choose the correct option:
1. | (a), (b), (d) |
2. | (b), (c), (a) |
3. | (c), (d), (b) |
4. | (a), (c), (d) |
A charged particle moves along a circle under the action of possible constant electric and magnetic fields. Which of the following are possible?
(a) | \(E=0, ~B=0\) |
(b) | \(E=0, ~B\ne0\) |
(c) | \(E\ne0, ~B=0\) |
(d) | \(E\ne0, ~B\ne0\) |
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) By’ = By + \(\frac{\mathrm{vE}_{\mathrm{z}}}{\mathrm{c}^{2}}\)
(b) Ey’ = Ey – \(\frac{\mathrm{vB}_{\mathrm{z}}}{\mathrm{c}^{2}}\)
(c) B’y = By + vEz
(d) E’y = Ey + vBz
Choose the correct option
1. (a), (b)
2. (b), (c)
3. (c), (d)
4. (a), (d)