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Q.

An electron moving in a circular orbit of radius r makes n rotations per second. The magnetic field produced at the centre has magnitude

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a

μ0n2er

b

μ0ne2r

c

μ0ne2πr

d

Zero

answer is B.

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Detailed Solution

Current in the orbit, I=eTI=e(2π/ω)=ωe2π=(2πn)e2π=neMagnetic field at centre of current carrying circular coil is given byB=μ0I2r=μ0ne2r
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