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CBSE Class 12 Physics Current Electricity
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In the equation AB = C, A is the current density, C is the electric field, Then B is
The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then
A battery of emf E and internal resistance r is connected across a resistance R. Resistance R can be adjusted to any value greater than or equal to zero. A graph is plotted between the current (i) passing through the resistance and potential difference (V) across it. Select the correct alternative(s).