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Earn 100

Discuss the method of determination of unknown resistance by metre bridge method.

Important Questions on Current Electricity

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Explain drift of electrons and the origin of resistivity in conductors.
OR
Explain working of chemical cell. How emf is realised in a chemical cell and describe the relation between emf and internal resistance of the cell.

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The equivalent resistance between the points A and B is

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In the given circuit, total power consumed is 200 W. The value of resistance R is

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A resistance of 37×102Ω±10% can be represented by colour coding respectively as
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The emf of a cell is 1.6 V. On connecting external 15Ω resistance across the cell, the terminal potential difference falls to 1.5 V. The internal resistance of the cell is
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The resistance of the four arms P, Q, R and S in a Wheatstone's bridge are 2Ω, 4Ω, 4Ω and 8Ω respectively as shown in figure. Current through the galvanometer will be

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100 cm of potentiometer wire balance the e.m.f of a cell and 75 cm wire required for balance the terminal voltage of the cell, when it is shunted by 6Ω resistor. The internal resistance of the cell is
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The length AB of slide wire bridge is 100 cm long. Where should be free end of the galvanometer be connected on AB so that galvanometer may show zero deflection?

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