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Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

If the electric lines of force are shaped like arcs of concentric circles with their centre at point $O$ in a certain section of an electric field, then

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Answer:

Solution:

To prove this we will calculate work done by electric force in a close loop ABCD.

During displacement AD and BC work done by electric force = 0 as electrostatic is perpendicular to displacement.

Work done during $A B = R α E_{1}$

Work done during $C D = - r α E_{2}$

Total work done $= R α E_{1} - r α E_{2}$

Close loop work done should be zero

$∴ \frac{E_{1}}{E_{2}} = \frac{r}{R}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:MagnetismSubtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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