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Question

Two particles A and B having equal charges +6C, after being accelerated through the same potential difference, enter 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
49
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B
95
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C
12
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D
13
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Solution

The correct option is A 49
r=2mEeB=2mVeB2
Two particles each of charge 6C under same magnetic field
rm
r1r2=m1m2
squaring both sides
m1m2=(r1r2)2=49

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