Question

What happens to the deflection of the compass needle placed at a point near current-carrying straight conductor, if :
(a) If the current is increased?
(b) If the direction of current in the conductor is reversed?
(c) If the compass is moved away from the conductor?

Answer 1

$\left(a\right)$ Deflection increases when current through conductor increases.

$\left(b\right)$ Direction of deflection is reversed when direction of current is reversed.

$\left(c\right)$ Deflection decreases when the compass is moved away.