AP EAMCET · PHYSICS · Magnetic Effects of Current
If \(B_1\) is the magnetic field induction at a point on the axis of a circular coil of radius \(R\) situated at a distance \(R \sqrt{3}\) and \(B_2\) is the magnetic field at the centre of the coil, then the ratio of \(\frac{B_1}{B_2}\) is equal to
- A \(\frac{1}{3}\)
- B \(\frac{1}{8}\)
- C \(\frac{1}{4}\)
- D \(\frac{1}{2}\)
Answer & Solution
Correct Answer
(B) \(\frac{1}{8}\)
Step-by-step Solution
Detailed explanation
According to question, \(B_1=\frac{\mu_0 I R^2}{2\left(R^2+r^2\right)^{3 / 2}}\) Here, \(\quad r=R \sqrt{3}\)…
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