two rings .... electrostat.... interesting one....

JEE Mains 2015 Tutorials › Electricity and magnetism questions › two rings .... electrostat.... interesting one....

Two identical thin rings each of radius R are co axially placed a R distance apart . If Q₁ & Q₂ are respectively the uniformly spread on the two rings , the work done in moving a charge "q" from the center of one ring to the center of the other is:

a) zero

b)k q ( Q₁ - Q₂ )(âˆš2 - 1)âˆš2R

c)k q âˆš2 (Q₁ + Q₂)1

d)(âˆš2 + 1) q (Q₁ + Q₂)âˆš2R

(ans is b)

#Physics #Electricity and magnetism

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Great Dreams ·2010-02-20 03:09:30

due to less time
copy pasting

bt we can straight away guess B as answer bcause by putting R1=R2 we must get 0 ;)

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