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Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMotion analysis in electric & magnetic fieldMedium2 minQB

PhysicsMediumsingle choice

A particle have a charge $20 μ C$ and mass $20 μ g$ moves along a circle of radius 5 cm under the action of a magnetic field $B = 0.1$ tesla. When the particle is at P , a uniform electric field is switched on and it is found that the particle continues on the tangent with a uniform velocity. Find the electric field.

Options:

Answer:

Solution:

Convert the mass:

$m = 20 μ g = 2 \times 1 0^{- 8} kg$

$q v B = \frac{m v ^{2}}{r} \Rightarrow v = \frac{qB r}{m} = 5 m/s$

For uniform tangential motion, electric and magnetic forces cancel.

$E = - v \times B$

$E = v B = 5 (0.1) = 0.5 V/m$

Answer C.

Stream:JEESubject:PhysicsTopic:MagnetismSubtopic:Motion analysis in electric & magnetic field

⏱ 2mℹ️ Source: QB

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