Questions
The cell has an emf of 2 V and the internal resistance of this cell is It is connected to resistance of , the voltage across the cell will be
detailed solution
Correct option is C
The voltage across cell terminal will be given byV=E−irwhere r is internal resistance.Also current, i=ER+r∴ V=E−ER+rrPutting the numerical values, we haveE=2V, r=0.1 Ω, R=3.9 ΩV=2−23.9+0.1 × 0.1V = 1.95 VTalk to our academic expert!
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An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of (4/3) and (2/3), then the ratio of the currents passing through the wires will be
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