Question

Identify the CORRECT statement

• A. The direction of eddy currents can be determined by the Left-Hand Rule.
• B. Eddy currents always perform useful work and increase the efficiency of all electrical devices.
• C. Eddy currents circulate in planes perpendicular to the magnetic field that induces them.
• D. Eddy currents are present only in non-magnetic materials like aluminum

Hint:

Eddy currents follow Lenz's law, usually waste energy, and flow in loops perpendicular to the changing magnetic field.

Answer 1

The Correct Option is C

Step 1: Elimination
The first statement is wrong because the direction follows Lenz's law. The second is wrong because the word 'always' is false, as eddy currents often cause losses.

Step 2: Material check
They also appear in magnetic materials such as iron cores, so the claim that they appear only in non-magnetic metals is false.

Step 3: Result
Induced currents flow in loops lying in a plane perpendicular to the field, which makes the third statement correct.

Final Answer:
The loops of eddy current lie perpendicular to the inducing field. \[ \boxed{\text{(C) }\text{Eddy currents circulate in planes perpendicular to the magnetic field that induces them}} \]