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Question

A light beam travelling in the x-direction is described by the electric field Ey=(300Vm1)sinω(tx/c). An electron is constrained to move along the y-direction with a speed of 2.0×107m1 Find the maximum electric force and the maximum magnetic force on the electron

A
4.8×1017N,zero
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B
4.2×1018N,1.8×108N
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C
4.8×1017N,3.2×1018N
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D
Zero, Zero
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Solution

The correct option is A 4.8×1017N,zero
A light beam travelling
Ey=(300V/m)sinw(tx/c).
V=2.0×107m1
B0=F0C=3002×107=150×107T
Fm=B0qV
=9.1×1031×150×107×2×107
=2.8×1028×2
=4.8×1017N
magnetic force =0
because they are perpendicular to each other.

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