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Question

# If electron velocity is 2^i+3^j and it is subjected to magnetic field of 4^k, then itsspeed will changeboth (a) and (b)none of thesepath will change

A
speed will change
B
both (a) and (b)
C
none of these
D
path will change
Solution
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#### since magnetic field is perpendicular to the direction of option or the velocity vector of the electron. therefore, the force will always act perpendicular to the both direction of magnetic field as well as velocity vector of electron and electron will do a circular motion since magnetic field is uniform.Hence only direction of motion will change.

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