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Question

A positive charge q is projected in magnetic field of width mv2qB with velocity v as shown in figure. Then time taken by charged particle to emerge from the magnetic field is :

A
m2qB
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B
πm4qB
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C
πm2qB
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D
πm2qB
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Solution

The correct option is B πm4qB
sinθ=xR=(mv2qB)(mvqB)sinθ=12θ=π4Timet=θωt=π4mqB

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