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Electric potential at a point P on the axis of a short dipole is 4×10−3 volt. If distance of point P from the centre of the dipole is 10 cm, find the electric field at that point.

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a

0.45 V/m

b

0.08 V/m

c

0.04 V/m

d

0.4 V/m

answer is B.

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Detailed Solution

VP=14π∈0pr2 and EP=14π∈02pr3=2r(14π∈0pr2)∴ EP=2VPr=2×4×10−30.1 V/m=0.08 V/m

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Electric potential at a point P on the axis of a short dipole is 4×10−3 volt. If distance of point P from the centre of the dipole is 10 cm, find the electric field at that point.