Question

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?

• A. 1.2 × 10–5
• B. 1.2 × 10–3
• C. 1.8 × 10–3
• D. 2.4 × 10–5

Answer 1

Answer: (A)

1.2 × 10–5

Answer 2

The correct answer is (A) : 1.2 × 10–5
$\stackrel{→}{B^′}=μ_0(1+X)ni$ in the material
$\stackrel{→}{B}=μ_0ni$ without material
So fractional increase is
$\frac{B^′−B}{B}=X=1.2×10^{−5}$’