A compass needle is placed near a current carrying wire. State your observation for the following cases, and give reason for the same in each case. a. Magnitude of electric current in the wire is increased b. The compass needle is displayed away from the wire.
Answer. (a) Observation: The deflection of the needle increases. Reason: Magnetic field strength due to current-carrying wire increases as current in the wire increases, B ∝ l. (b) Observation: The deflection in the compass needle decreases as its displacement from the current-carrying wire increases
