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Question

Magnetic field of magnitude B0 exist in the region above the line as shown in figure. A charged particle of mass m and charge q moving at speed 'u' enters magnetic field region. Find time interval for which particle remains in magnetic field.

A
2πmθqBπ
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B
2πmqB(1θπ)
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C
mθqB
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D
2mθqB(1θ1π)
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Solution

The correct option is B 2πmqB(1θπ)
By geometry, α=2θ
Here, T=2πRV=2πmqB
So time t=T2π×(2πα)
t=T(1α2π)=T(1θπ)
=2πmqB(1θπ)

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