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Science

Ingestion-and-Digestion-1

Easy

Question

A thin homogeneous rod of mass m and length $lambda$ is free to rotate in vertical plane about a horizontal axle pivoted at one end of the rod. A small ball of mass m and charge q is attached to the opposite end of this rod. The whole system is positioned in a constant horizontal electric field of magnitude $E equals fraction numerator m g over denominator 2 q end fraction$ The rod is released from shown position from rest.

What is the angular acceleration of the rod at the instant of releasing the rod?

$\frac{8 g}{9 t}$
$\frac{3 g}{2 t}$
$\frac{9 g}{8 t}$
$\frac{2 g}{9 t}$

The correct answer is: $fraction numerator 9 g over denominator 8 t end fraction$

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