EASY
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IMPORTANT
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The conversion of a moving coil galvanometer into a voltmeter is done by which of the following ?

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Important Questions on Current Electricity

HARD
JEE Main
IMPORTANT
Two long coaxial and conducting cylinders of radius a and b are separated by a material of conductivity σ and a constant potential difference V is maintained between them, by a battery. Then the current per unit length of the cylinder flowing from one cylinder the other is 
MEDIUM
JEE Main
IMPORTANT
In a semiconductor, mobility of electron, i.e., drift velocity per unit applied electric field is 1.6 (S.Ι. unit). The density of electron is 1019 m-3 (Neglect holes concentration). The resistivity of semiconductor is n Ω m. Write the value of 10n to the nearest integer.
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JEE Main
IMPORTANT
What is the charge (in C) that passes through the cross-section of a wire in the time interval t=3 s to t=5 s, when it is known that current in the wire is given by the equation I=2t2-3t+1? (Approximate the answer to the nearest integer)
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IMPORTANT

In the circuit shown, cells A and B have negligible resistances. For VA=12 VR1=500 Ω and R=100 Ω, galvanometer (G) shows no deflection. The value of VB is

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EASY
JEE Main
IMPORTANT

What is the current in the 4 Ω resistor when switch S1 is open and switch S2 is closed in the given circuit?

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MEDIUM
JEE Main
IMPORTANT
A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of 
HARD
JEE Main
IMPORTANT
Given two resistance are R1=5.0±0.2 Ω and R2=10.0±0.1 Ω. What is total resistance in parallel with possible percentage error?
HARD
JEE Main
IMPORTANT
The equivalent resistance of the combination across AB (figure) is
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