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JEE PHYSICS MCQ: ELECTRIC POTENTIAL AND CAPACITANCE

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A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r (much larger than the size of the dipole), then the electric intensity E at Q is proportional to

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Correct option: D

{r^{ - 3}}

Option D is correct because the electric field intensity at a point on the perpendicular bisector of a dipole is inversely proportional to the cube of the distance, i.e.,

E \propto \frac{{1}}{{r^3}}

.

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The potential at a point distance

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V(x)=\frac{20}{x^2-5} \mathrm{V}

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is given by: A parallel plate capacitor is connected to a 5V battery and charged. The battery is then disconnected and a glass slab is introduced between the plates. Then, the quantities that decrease are A conducting sphere of radius

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. The electric potential and the electric field at the centre of the sphere respectively are Two capacitors when connected in series have a capacitance of

3\mu F,\,

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. Their individual capacities are Statement-1: If temperature is increased, the dielectric constant of a polar dielectric decreases whereas that of a non-polar dielectric does not change significantly.
Statement-2: The magniude of dipole moment of individual polar molecule decreases significantly with increase in temperature. An electric dipole when placed in a uniform electric field

E

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E