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Physics-

General

Easy

Question

A particle of charge +q and mass m moving under the influnce of a uniform electric field $E stack i with hat on top$ and a uniform magnetic field $B stack k with hat on top$ follows trajectory from P to Q as shown in figure The velocities at P and Q $v stack i with hat on top$ and $negative 2 v stack j with hat on top$ respectively Which of the following statement(s) is/are correct

$E = \frac{3}{4} \frac{m v^{2}}{q a}$
Rate of work done by electric field at P is $\frac{3}{4} \frac{m v^{3}}{a}$
Rate of work done by electric field at P is zero
Rate of work done by both the fields at Q is zero

The correct answer is: $E equals fraction numerator 3 over denominator 4 end fraction fraction numerator m v to the power of 2 end exponent over denominator q a end fraction$

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