A $4\,\mu F$ conductor is charged to $400\, volts$ and then its plates are joined through a resistance of $1\,k\Omega $. The heat produced in the resistance is ............... $J$
Medium
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Heat produced = Energy stored in capacitor
$ = \frac{1}{2}C{V^2}$$ = \frac{1}{2} \times 4 \times {10^{ - 6}} \times {(400)^2}$$ = 0.32\,\,J$
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A series combination of two resistors $1\,\Omega $ each is connected to a $12\,V$ battery of internal resistance $0.4\,\Omega $. The current flowing through it will be ............... $A$
Resistance in the two gaps of a meter bridge are $10\, ohm$ and $30\, ohm$ respectively. If the resistances are interchanged the balance point shifts by.............. $cm$
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