Question

A negative charge is coming towards the observer.The direction of the magnetic field produced by it will be (as seen by observer)

• A. Clockwise
• B. Anti-clockwise
• C. In the direction of motion of charge
• D. in the direction opposite to the motion of charge

Answer 1

The correct option is A Clockwise

A negative charge is coming towards the observer$.$

The direction of the magnetic field produced by it will be in a clockwise direction$.$

Magnetic field $=\mu 0i/4\times pi(d1\times r)/mod{r}^3$

Here $B$ is the direction of the $i(d1\times r)$

Hence$,$ the charge is negative$,i=-qdt$

Put the value in the equation$,$

$B$ is along $–qdt(d1\times r)along–(d1\times r)$

So $,$the observer will see the magnetic field in a clockwise direction$.$

Hence,

option $\left(A\right)$ is correct answer.