AP EAMCET · PHYSICS · Magnetic Effects of Current
A closely wound solenoid of 1200 turns and area of cross-section \(5 \mathrm{~cm}^2\) carries a current. If the magnetic moment of the solenoid is \(1.2 \mathrm{~J} \mathrm{~T}^{-1}\), then the current through the solenoid is
- A 2.5 A
- B 2 A
- C 3 A
- D 1.5 A
Answer & Solution
Correct Answer
(B) 2 A
Step-by-step Solution
Detailed explanation
\(A = 5 \mathrm{~cm}^2 = 5 \times 10^{-4} \mathrm{~m}^2\) \(I = \frac{\mu}{NA}\) \(I = \frac{1.2}{1200 \times 5 \times 10^{-4}}\) \(I = 2 \mathrm{~A}\)
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