JEE Mains · Physics · STD 12 - 4. Moving charges and magnetism
The space inside a straight current carrying solenoid is filled with a magnetic material having magnetic susceptibility equal to \(1.2 \times 10^{-5}\). What is fractional increase in the magnetic field inside solenoid with respect to air as medium inside the solenoid?
- A \(1.2 \times 10^{-5}\)
- B \(1.2 \times 10^{-3}\)
- C \(1.8 \times 10^{-3}\)
- D \(2.4 \times 10^{-5}\)
Answer & Solution
Correct Answer
(A) \(1.2 \times 10^{-5}\)
Step-by-step Solution
Detailed explanation
\(\chi=1.2 \times 10^{-5}\) \(\mu_{ r }=1+\chi=1+1.2 \times 10^{-5}\) Fractional Change \(=\frac{\Delta B }{ B }=\frac{\mu_{0} \mu_{ I } ni -\mu_{0} ni }{\mu_{0} ni }=\left(\mu_{ r }-1\right)\) \(=1.2 \times 10^{-5}\)
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