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Question

Cathode rays are moving along the positive Z-axis.An electric field is applied along positive Y-axis. In the same region, a magnetic field is also applied.The cathode rays pass undeviated in this region.What is the direction of the magnetic field?

A
Positive x-axis
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B
Negative x-axis
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C
Negative y-axis
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D
Positive z-axis
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Solution

The correct option is C Negative x-axis
The electric force on cathode rays is in +Y direction. In order to balance it, magnetic force should act in Y direction. Magnetic field should be in -X axis.
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