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Q.

An arc of a circle of radius R subtends an angle π2 at the centre. It carries a current i. The magnetic field at the centre will be

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a

μ0i2R

b

μ0i8R

c

μ0i4R

d

2μ0i5R

answer is B.

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Detailed Solution

B= μ04π θir = μ04π ×  π2 × iR = μ0i8R
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An arc of a circle of radius R subtends an angle π2 at the centre. It carries a current i. The magnetic field at the centre will be