Current Electricity

Related Questions

• There is a current of 1.344 amp in a copper wire whose area of cross-section normal to the length of the wire is 1$m{m^2}$. If the number of free electrons per $c{m^3}$ is $8.4 \times {10^{22}}$, then the drift velocity would be

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• Two identical cells send the same current in $2\,\Omega $ resistance, whether connected in series or in parallel. The internal resistance of the cell should be

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• Which one is not the correct statement

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• A galvanometer of resistance $25\,\Omega $ gives full scale deflection for a current of 10 milliampere, is to be changed into a voltmeter of range 100 V by connecting a resistance of ‘R’ in series with galvanometer. The value of resistance R in $\Omega $ is

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• A resistance of $4\,\Omega $ and a wire of length 5 metres and resistance $5\,\Omega $ are joined in series and connected to a cell of e.m.f. 10 V and internal resistance $1\,\Omega $. A parallel combination of two identical cells is balanced across 300 cm of the wire. The e.m.f.E of each cell is

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