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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 right of direction of motion

b

it will turn towards left of direction of motion

c

its velocity will decrease

d

its velocity will increase

answer is C.

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Detailed Solution

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Electrostatic force on the electron will act in opposite direction of the field and the magnetic field will be zero as the angle between velocity of the electron and the magnetic field is zero. 

So, velocity of the electron will decrease due to electrostatic force.

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