A point charge – q is carried from a point A to another point B on the axis of a charged ring of radius ‘r’carrying a charge +q. If the point A is at a distance 4/{3} rfrom the centre of the ring and the point B is3/{4} rfrom the centre but on the opposite side, what is the net work that need to be done for this ?

Correct Answer is : −15q24πε0r

-7/{5} \frac{q^2}{4\pi\epsilon_\0r}

-1/{5} \frac{q^2}{4\pi\epsilon_\0r}

7/{5} \frac{q^2}{4\pi\epsilon_\0r}

1/{5} \frac{q^2}{4\pi\epsilon_\0r}

WBJEE 2018 Physics Solved Paper

Question : 9 of 39

Marks: +1, -0

A point charge – q is carried from a point A to another point B on the axis of a charged ring of radius ‘r’carrying a charge +q. If the point A is at a distance

rfrom the centre of the ring and the point B is

rfrom the centre but on the opposite side, what is the net work that need to be done for this ?

−
7
5
q2
4πε0r
−
1
5
q2
4πε0r
7
5
q2
4πε0r
1
5
q2
4πε0r

Validate

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