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: Understanding the Concept
Eddy currents are closed loops of induced current produced in a bulk conductor by a changing magnetic flux.

Step 2: Check each statement
Their direction comes from Lenz's law, not a left-hand rule. They usually waste energy as heat and reduce efficiency. They occur in any conductor, including iron and aluminium.

Step 3: Find the true one
The loops lie in planes perpendicular to the inducing magnetic field, so the third statement is correct.

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