A particle is projected with a velocity ( 10 m/s ) along y- axis from point (2, 3) . Magnetic field

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4.Moving Charges and Magnetism

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A particle is projected with a velocity ( $10\ m/s$ ) along $y-$ axis from point $(2, 3)$ . Magnetic field of $\left( {3\hat i + 4\hat j} \right)$ Tesla exist uniformly in the space. Its speed when particle passes through $y-$ axis for the third time is : (neglect gravity)

A

$\sqrt {20} \,m/s$

B

$\sqrt {60} \,m/s$

C

$\sqrt {30} \,m/s$

D

$10\ m/s$

Solution

Magnetic field can do no work

$\therefore \,K{E_f} = K{E_i}$

$v = v_0$

Standard 12

Physics

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