Question

In Oersted's experiment, deflection in magnetic needle

• A. decreases if current is increased in the wire
• B. reverses if current is reversed in the wire
• C. remains constant if current is increased
• D. All above statements are true

Answer 1

The correct option is B reverses if current is reversed in the wire

In Oersted's experiment,

1. Deflection in the magnetic needle decreases when the current through the wire is decreased and vice versa.

2. If the direction of current is reversed in the wire, the deflection in magnetic needle also reverses.

Based on these observations, Oersted concluded that moving charges or current produce a magnetic field in surrounding space.

So, option $\left(b\right)$ is correct.