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Q.

An electron is moving on a circular path of radius r with speed v in a transverse magnetic field B. The value e/m for the electron will be

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a

$\frac{v}{r B}$

b

$\frac{B}{r v}$

c

Bvr

d

$\frac{v r}{B}$

answer is A.

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Detailed Solution

Radius of the circular path is given as

$r = \frac{m v}{q B}$

$\frac{q}{m} = \frac{v}{r B}$

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