#### A proton (mass m) accelerated by a potential difference V flies through a uniform transverse magnetic field B.  The field occupies a region of space by width 'd'. If 'a' be the angle of deviation of proton from initial direction of motion (see figure), the value of will  be : Option 1) Option 2) Option 3) Option 4)

As we learnt in

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Energy of Proton

Magnetic force

From the figure

Option 1)

Incorrect

Option 2)

Incorrect

Option 3)

Correct

Option 4)

Incorrect