MCQ
The magnet can be completely demagnetized by
- ABreaking the magnet into small pieces
- BHeating it slightly
- CDroping it into ice cold water
- ✓A reverse field of appropriate strength
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| Heat flow | Electrostatics |
| $T( r )$ | $V( r )$ |
| $j ( r )$ | $E ( r )$ |
We exploit this equivalence to predict the rate $Q$ of total heat flowing by conduction from the surfaces of spheres of varying radii, all maintained at the same temperature. If $\dot{Q} \propto R^{n}$, where $R$ is the radius, then the value of $n$ is

