Kirchhoff's second law is based on the law of conservation of [RPET 2003; MH CET 2001]
The figure below shows currents in a part of electric circuit. The current i is [CPMT 1981; RPET 1999]
The terminal potential difference of a cell is greater than its e.m.f. when it is
In charging V > E.
In the circuit shown, potential difference between X and Y will be
In open circuit of a cell V = E
In the previous question, potential difference across the 40Ω resistance will be
Zero (Circuit open means no current and hence no potential difference across resistance).
In the circuit shown, A and V are ideal ammeter and voltmeter respectively. Reading of the voltmeter will be
When a resistance of 2 ohm is connected across the terminals of a cell, the current is 0.5 amperes. When the resistance is increased to 5 ohm, the current is 0.25 amperes. The internal resistance of the cell is [MP PMT 1996]
The terminal potential difference of a cell when short-circuited is (E = E.M.F. of the cell)
In short circuiting R = 0, so V = 0
A primary cell has an e.m.f. of 1.5 volts, when short-circuited it gives a current of 3 amperes. The internal resistance of the cell is [CPMT 1976, 83]
A 50V battery is connected across a 10 ohm resistor. The current is 4.5 amperes. The internal resistance of the battery is [CPMT 1985; BHU 1997; Pb. PMT 2001]
The potential difference in open circuit for a cell is 2.2 volts. When a 4 ohm resistor is connected between its two electrodes the potential difference becomes 2 volts. The internal resistance of the cell will be [MP PMT 1984; SCRA 1994; CBSE PMT 2002]
A new flashlight cell of e.m.f. 1.5 volts gives a current of 15 amps, when connected directly to an ammeter of resistance 0.04Ω. The internal resistance of cell is [MP PET 1994]
A cell whose e.m.f. is 2 V and internal resistance is 0.1Ω, is connected with a resistance of3.9Ω. The voltage across the cell terminal will be [CPMT 1990; MP PET 1993; CBSE PMT 1999; AFMC 1999; Pb. PMT 2000; AIIMS 2001]
The reading of a high resistance voltmeter when a cell is connected across it is 2.2 V. When the terminals of the cell are also connected to a resistance of 5Ω the voltmeter reading drops to 1.8 V. Find the internal resistance of the cell [KCET 2003; MP PMT 2003]
When cells are connected in parallel, then [MNR 1983]
In parallel, equivalent resistance is low
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