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A Mysterious Force

A proton move...

Question

A proton moves at a constant velocity of 50 m/s along the x-axis, in uniform electric and magnetic fields.The magnetic field is $\to B = (2.0 m T)^j$ .What is the electric field?

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Solution

Since the proton moves with constant velocity, the net force acting on it is zero.
Hence the electric field and magnetic force cancel each other.
$⟹ q \to E = - q (\to v \times \to B)$
$⟹ \to E = (- 0.1 V / m)^k$

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