MEDIUM
JEE Main
IMPORTANT
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A cell of internal resistance r drives current through an external resistance R. The power delivered by the cell to the external resistance will be maximum when:

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Important Questions on Current Electricity

EASY
JEE Main
IMPORTANT

In the figure shown, what is the current (in ampere) drawn from the battery? You are given:
R1=15 Ω , R2=10 Ω , R3=20 Ω , R4=5 Ω, R5=25 Ω, R6=30 Ω, E=15 V
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MEDIUM
JEE Main
IMPORTANT
A current of 5 A passes through a copper conductor (resistivity =1.7×10-8 Ω m ) of radius of cross-section  5 mm . Find the mobility of the charges if their drift velocity is  1.1×10-3 m s-1 .
MEDIUM
JEE Main
IMPORTANT

In the given circuit, an ideal voltmeter connected across the 10 Ω resistance reads  2 V . The internal resistance r, of each cell is:
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MEDIUM
JEE Main
IMPORTANT
In a meter bridge experiment, the circuit diagram and the corresponding observation table are shown in figure.
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S. No. RΩ lcm

1.
2.
3.
4.

1000
100
10
1

60
13
1.5
1.0

Which of the reading is inconsistent?
MEDIUM
JEE Main
IMPORTANT

In an experiment, the resistance of a material is plotted as a function of temperature (in some range). As shown in the figure, it is a straight line.

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One may conclude that

MEDIUM
JEE Main
IMPORTANT
Space between two concentric conducting spheres of radii a and b (b>a) is filled with a medium of resistivity  ρ . The resistance between the two spheres will be:
MEDIUM
JEE Main
IMPORTANT
A potentiometer wire AB having length L and resistance 12r is joined to a cell D of emf ε and internal resistance r. A cell C having EMF ε/2 and internal resistance 3r is connected. The length AJ, at which the galvanometer, as shown in the figure, shows no deflection is

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MEDIUM
JEE Main
IMPORTANT
In the given circuit the cells have zero internal resistance. The currents (in amperes) passing through resistance R1 and R2 respectively, are:

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