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The effective resistance between A and B (if each resistance have value r ) will be

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Important Questions on Current Electricity

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Gamma Question Bank for Engineering Physics>Chapter 17 - Current Electricity>EXERCISE>Q 44

A potentiometer consists of a wire of length 4 m and resistance 10 Ω. It is connected to a cell of e.m.f. 2 V. The potential difference per unit length of the wire will be 

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Gamma Question Bank for Engineering Physics>Chapter 17 - Current Electricity>EXERCISE>Q 45
A galvanometer gives full scale deflection with 0.2 A in its coil. The resistance of its coil is 10 Ω.. How much shunt resistance is required to convert it into an ammeter to read current up to 1.8 A ?
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Gamma Question Bank for Engineering Physics>Chapter 17 - Current Electricity>EXERCISE>Q 46
In a potentiometer experiment, two primary cells are connected in series to support each other and then connected to oppose each other. The balance points are obtained at 4 m and 1 m respectively. The ratio of electromotive forces of the two cells is
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Gamma Question Bank for Engineering Physics>Chapter 17 - Current Electricity>EXERCISE>Q 47
For a cell of emf 2 V, a balance point is obtained for 50 cm of the potentiometer wire. If the cell is shunted by a 2 Ω resistor, the balance is obtained across 40 cm of the wire, then the internal resistance of the cell is
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Gamma Question Bank for Engineering Physics>Chapter 17 - Current Electricity>EXERCISE>Q 48
A galvanometer of resistance 2Ω and having full scale deflection for a current of 100 mA can be converted into a volt meter of range 5 Volt by connecting a resistance R in series with galvanometer. The resistance 'R' is
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Gamma Question Bank for Engineering Physics>Chapter 17 - Current Electricity>EXERCISE>Q 49
Voltmeters V1 and V2 are connected in series across a DC line. V1 reads 80 V and has a per volt resistance of 200 Ω. V2 has a total resistance of 32 kΩ. The line voltage is
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Gamma Question Bank for Engineering Physics>Chapter 17 - Current Electricity>EXERCISE>Q 50

In the following circuit a capacitor is charged from q=0 to q=2μC after switching on the circuit find energy delivered by the cell.

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Gamma Question Bank for Engineering Physics>Chapter 17 - Current Electricity>EXERCISE>Q 51

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When will this capacitor get maximum charge, and what will be values of maximum charge and current at that state of the circuit?