TS EAMCET · Physics · Magnetic Effects of Current
A circular coil of area \(2 \mathrm{~cm}^2\) has 1000 turns. If the current through the coil is \(1 \mathrm{~A}\), then its magnetic moment is
- A \(4 \mathrm{Am}^2\)
- B \(0.2 \mathrm{Am}^2\)
- C \(0.4 \mathrm{Am}^2\)
- D \(2 \mathrm{Am}^2\)
Answer & Solution
Correct Answer
(B) \(0.2 \mathrm{Am}^2\)
Step-by-step Solution
Detailed explanation
Area of coil, \(A=2 \mathrm{~cm}^2=2 \times 10^{-4} \mathrm{~m}^2\) No. of turns, \(n=1000\) Current, \(\mathrm{I}=1 \mathrm{~A}\) Magnetic moment is given by: \[ \begin{aligned} & M=n I A \\ & =(1000)(1)\left(2 \times 10^{-4}\right) \\ & M=0.2 \mathrm{Am}^2 \end{aligned} \]
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