CUET · PHYSICS · PYQ PAPER 2025
An iron ring of relative permeability \( \mu_r \) is introduced inside a toroidal solenoid having n turns per meter. If the current in the solenoid is I, then the magnetic field in the ring is :
- A \( \frac{\mu_0 \mu_r I}{\sqrt{n}} \)
- B \( \frac{\mu_0 \mu_r I}{n^2} \)
- C \( \mu_0 \mu_r n^2 I \)
- D \( \mu_0 \mu_r n I \)
Answer & Solution
Correct Answer
(D) \( \mu_0 \mu_r n I \)
Step-by-step Solution
Detailed explanation
\( B = \mu_0 \mu_r n I \) -\(B\) is the magnetic field inside the solenoid, - \(\mu_0\) is the permeability of free space, - \(\mu_r\) is the relative permeability of the core (iron ring in this case), - \(n\) is the number of turns per meter in the solenoid, - I is the current…
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