A small metal ball is suspended in a uni...

A small metal ball is suspended in a uniform electric field with the help of an insulated thread. If a high-energy X-ray beam falls on the ball, then the ball will be deflected in the direction of the field.

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When X-rays fall on the metal ball, some electrons emit from it due to photoelectric effect. The ball thus gets positively charged and on a positively charged ball an electrostatic force in the direction of electric field acts. Due to this force ball gets deflected in the direction of electric field.

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