Cathode rays are made to pass between the poles of a magnet. The effect of magnetic field is
A
to increase their velocity
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B
to deflect them towards north pole
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C
to deflect them towards south pole
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D
to deflect them out of the plane of magnetic field
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Solution
The correct option is D to deflect them out of the plane of magnetic field When a magnetic field is applied, the cathode ray is deflected from its normal straight path into a curved path which can be identified by right hand thumb rule.