JEE Mains · Physics · STD 12 - 4. Moving charges and magnetism
The magnetic field at the centre of a current carrying circular loop of radius \(R\) is 16 \(\mu\)T. The magnetic field at a distance \(x = \sqrt{3}R\) on its axis from the centre is ________ \(\mu\)T.
- A \(2\sqrt{2}\)
- B 4
- C 2
- D 8
Answer & Solution
Correct Answer
(C) 2
Step-by-step Solution
Detailed explanation
\(\frac{\mu_{0}I}{2R} = 16 \mu T\) \(\frac{\mu_0 I R^2}{2\left(x^2+R^2\right)^{3 / 2}}=\frac{\mu_0 I R^2}{2 \times 8 R^3}=2 \mu T\)
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