Question

If a charge particle at rest experiences no
electromagnetic force, then
(1) The electric field must be zero
(2) The magnetic field may be zero
(3) The magnetic field must be zero
(4) Both (1) and (2)

Answer 1

Answer:

4 .........................

Answer 2

♦️Answer:

Option 4

♦️Explanation:

✔️Force due to electric field = qE

✔️So this force is zero when charge =

0 or electric field = 0.

Now, q ≠ 0 (given in que) therefore electric must be zero .

Now force due to magnetic force = q x v x b x sin theta.

So this force will be zero when either q = 0 or v = 0 or b = 0 or sin theta = 0.

So in this case v = 0 charge at rest so it cannot be predicted whether magnetic field is zero or not.

Thus , magnetic may or may not be zero.