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Question

Two particles A and B having equal charges +6 C after being accelerated through the same potential difference enter in a region of uniform magnetic field and describe circular paths of radii 2cm and 3cm respectively. The ratio of mass of A to that of B is :

A
13
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B
12
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C
49
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D
95
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Solution

The correct option is C 49
Since, r=2mqVqB=2mVqB2=r1r2=m1m2
m1m2=r21r22
Hence, m1m2=(2)2(32)=49

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