An electron is moving with initial velocity v = V_0 j in a magnetic field B = B_0 i. Its de-Broglie wavelength will

MHT CET 2026 Physics question

An electron is moving with initial velocity in a magnetic field . Its de-Broglie wavelength will

(A)decrease with time.
(B)increase and decrease periodically.
(C)remains constant.Correct
(D)increase with time.

Answer: (C)

Solution

The velocity is perpendicular to the field , so the electron experiences a magnetic force which is always perpendicular to its velocity. A force perpendicular to the velocity does no work, so the kinetic energy and hence the

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Question ID VK-101454