Questions
Two identical thin rings, each of radius R metre are co-axially placed at distance R metre apart. If Q1 and Q2 coulomb are respectively the charges uniformly spread on the two rings, the work done in moving a charge q from the centre of one ring to that of the other is :
detailed solution
Correct option is B
Potential energy of point charge placed on the axial line of the ring is U=q4πε0QR2+x2Ui=q4πε0Q1R+Q22RUf=q4πε0Q2R+Q12R ; W=Uf-Ui =q4πε0Q2R+Q12R-q4πε0Q1R+Q22R =q42πε0RQ2-Q12-1 Q1-Q2 or Q2-Q1 depends on starting and beginning of qSimilar Questions
A ring of radius I caries a charge +q. A test charge -qo is released on its axis at a distance from its centre. How much kinetic energy will be acquired by the test charge when it reaches the centre of the ring ?
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