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A particle leaves the origin with a speed of 3.5 106 m/s at 28 degrees to...

A particle leaves the origin with a speed of 3.5 106 m/s at 28 degrees to the positive x axis. It moves in a uniform electric field directed along positive y axis. Find Ey such that the particle will cross the x axis at x = 1.5 cm if the particle is an electron

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