Which one of the following statements regarding a current-carrying solenoid is <strong>NOT</strong> correct?
- A. The magnetic field inside the solenoid is uniform.
- B. The current-carrying solenoid behaves like a bar magnet.
- C. The magnetic field inside the solenoid increases with increase in current.
- D. If a soft iron bar is inserted inside the solenoid, the magnetic field remains the same. ✓
Correct Answer: D. If a soft iron bar is inserted inside the solenoid, the magnetic field remains the same.
Explanation
When a soft iron bar is inserted inside a current-carrying solenoid, it acts as an electromagnet core, which significantly increases the strength of the magnetic field.
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