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Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMagnetic ForceHard2 minPYQ_2013

PhysicsHardsingle choice

When a proton is released from rest in a room, it starts with an initial acceleration $a_{0}$ towards west. When it is projected towards north with a speed $v_{0}$ it moves with an initial acceleration $3 a_{0}$ towards west. The electric and magnetic fields in the room areNEET 2013 (All India)

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Solution:

Initial acceleration, $a_{0} = \frac{\partial E}{m}$ $\Rightarrow E = \frac{a _{0} m}{e} ∴ \frac{e v _{0} B + e E}{m} = 3 a_{0} or e v_{0} B + e E = 3 a_{0} m ∴ e v_{0} B = 3 m a_{0} - e E \Rightarrow = 3 m a_{0} - m a_{0} [fromeq. (i)] \Rightarrow e v_{0} B = 2 m a_{0} ∴ B = \frac{2 m a _{0}}{e v _{0}}$

Stream:NEETSubject:PhysicsTopic:MagnetismSubtopic:Magnetic Force

⏱ 2mℹ️ Source: PYQ_2013

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