Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMotion analysis in electric & magnetic fieldHard2 minQB
PhysicsHardnumerical

An electron moves through a uniform magnetic fieldB→=B0i^+2B0j^ T. At a particular instant of time, the velocity of electron isu→=3i^+5j^ m s-1. If the magnetic force acting on electron isF→=5ek^ N, whereeis the charge of electron, then the value ofB0is ____T.

Answer:
5.00
Solution:

Force acting on a charged particle under the magnetic field is given by, F→=qv→×B→.

⇒5ek⏜=e3i⏜+5j⏜×B0i⏜+2B0j⏜

⇒5ek⏜=e6B0k⏜-5B0k⏜

⇒B0=5 T

Stream:JEESubject:PhysicsTopic:MagnetismSubtopic:Motion analysis in electric & magnetic field
⏱ 2mℹ️ Source: QB

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