CUET · PHYSICS · PYQ PAPER 2023
The winding of the solenoid with 1000 turns per meter, core material with relative permeability 400 and carrying a current of 2 A, the magnetisation (M) is approximately given by :
- A 1.8 \(\times 10^5\) A/m
- B 3 \(\times 10^4\) A/m
- C 4 \(\times 10^5\) A/m
- D 2 \(\times 10^5\) A/m
Answer & Solution
Correct Answer
(A) 1.8 \(\times 10^5\) A/m
Step-by-step Solution
Detailed explanation
\(H = nI\) \(H = 1000 \times 2 = 2000 \text{ A/m}\) \(M = (\mu_r - 1)H\) \(M = (400 - 1) \times 2000\) \(M = 399 \times 2000\) \(M \approx 798000 \text{ A/m}\) \(M \approx 8 \times 10^5 \text{ A/m}\)
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