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Q.

A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected along the direction of the fields with a certain velocity then

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a

It will turn towards of the direction of motion.

b

It’s velocity will decrease

c

It’s velocity will increase

d

It will turn towards left of the direction of motion.

answer is C.

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Detailed Solution

Magnetic field exerts no force . electric field opposes the motion of the electron which carries a negative charge. Hence velocity of the electron decreases.

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