Question

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

• A. Clockwise
• B. Anticlockwise
• C. In the direction of motion of charge
• D. In the direction opposite to motion of charge

Answer 1

The correct option is A Clockwise

The motion of -ve charge can be visualized as flow of current in the direction opposite to motion of charge.

Thus according to right hand thumb rule, the direction of magnetic field is in clockwise direction.
$\begin{array}{c}\text{Why this question?}\\ \text{Tip: Right hand thumb states that if}\\ \text{we place the thumb pointing in direction}\\ \text{of current, the direction of curl will give}\\ \text{the direction of magnetic field.}\end{array}$