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Question

An ionised gas contains both positive and negative ions. If it is subjected simultaneously to an electric field along the +ve x-axis and a magnetic field along the +z direction then

A
Positive ions deflect towards +y direction and negative ions towards – y direction
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B
All ions deflect towards + y direction
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C
All ions deflect towards – y direction
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D
Positive ions deflect towards – y direction and negative ions towards + y direction.
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Solution

The correct option is C All ions deflect towards – y direction
As the electric field is switched on, positive ion will start to move along positive x-direction and negative ion along negative x-direction. Current associated with motion of both types of ions is along positive x-direction. According to Flemings left hand rule or right hand thumb rule, force on both types of ions will be along negative y-direction

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