Q.
An electron moves in a circular orbit with a uniform speed v. It produces a magnetic field B at the centre of the circle. The radius of the circle is proportional to
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a
Bv
b
vR
c
vB
d
Bv
answer is C.
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Detailed Solution
Electric current corresponding to the revolution of electron is i=ev2πr. Magnetic field due to circular current at the centre is B = μ04π . 2πir = μ04π . evr2 ⇒ r= μ04π .evB ⇒ r ∝ vB
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