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Olympiad workbook

Exam: Olympiad workbook
Subject: NSEP
Chapter: Magnetic Effects of Current

Olympiad workbook · NSEP · Magnetic Effects of Current

A wire in the shape of a square frame carries a current I and...

A wire in the shape of a square frame carries a current

I

and produces a magnetic field

B_{\mathrm{s}}

at its centre. Now the wire is bent in the shape of a circle and carries the same current. If

B_{\mathrm{c}}

is the magnetic field produced at the centre of the circular coil, then

B_s / B_c

is

Options

A $8 \pi^2$
B $8 \pi^2 / \sqrt{ } 2$
C $8 \sqrt{ } 2 / \pi^2$
D $8 \pi \sqrt{2}$

Correct answer

C. $8 \sqrt{ } 2 / \pi^2$

Step-by-step solution

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