Questions

A charge of Q coulomb is placed on a solid piece of metal of irregular shape. The charge will distribute itself

60 mins Expert Faculty Ask Questions

a

Uniformly in the metal object

b

Uniformly on the surface of the object

c

Such that the potential energy of the system is minimised

d

Such that the total heat loss is minimised

detailed solution

Correct option is C

Potential energy depends upon the charge at peaks of irregularities. Since every event in the universe leads to the minimisation of energy.

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Four identical charges $+50\mathrm{\mu C}$ each are placed, one at each corner of a square of side 2m. How much external energy is required to bring another charge of $+50\mathrm{\mu C}$ from infinity to the centre of the square

$\left(\text{Given}\frac{1}{4{\mathrm{\pi \epsilon}}_{0}}=9\times {10}^{9}\frac{{\mathrm{Nm}}^{2}}{{\mathrm{C}}^{2}}\right)$

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