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The space inside a straight current carrying solenoid is filled with a magnetic material having magnetic susceptibility equal to 1.2 × 10 –5 . What is fractional increase in the magnetic field inside solenoid with respect to air as medium inside the solenoid?

1. 1.2 × 10 –5
2. 1.2 × 10 –3
3. 1.8 × 10 –3
4. 2.4 × 10 –5

Correct answer: 1.2 × 10 –5

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