Question

A charged particle is creating magnetic field, It must be:

• A. moving
• B. stationary
• C. positively charged
• D. traveling through a wire
• E. negatively charged

Answer 1

The correct option is A moving

Magnetic field by point charge, $B=\left(\mu /4\pi \right).q.(\overrightarrow{v}\times \overrightarrow{r})/r^3$

Hence, for magnetic field, velocity of particle must not to be zero. Hence option A is correct.