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The percentage increase in magnetic field (B) when space within a current carrying solenoid is filled with magnesium (magnetic susceptibility χ Mg = 1.2 × 10 –5 ) is

1. 5 6 × 10 –3 %
2. 3 5 × 10 –5 %
3. 6 5 × 10 –5 %
4. 6 5 × 10 –4 %

Correct answer: 5 6 × 10 –3 %

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