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Q.

An electron accelerated through a potential difference y enters into a uniform transverse magnetic field and experiences a force F. If the accelerating potential increases to 2V, the electron in the same magnetic field will experience a force :

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a

F

b

F/2

c

2F

d

2F

answer is C.

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Detailed Solution

12mv2=eV  or  V=(2eV/m)1/2Force F =evB=eB(2eV/m)1/2  or  F∝VWhen V is doubled, then F' = 2⋅F
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