EASY
JEE Advanced
IMPORTANT
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A wire of radius r has resistance R. If it is stretched to a wire of radius r2, then the resistance of the wire becomes:

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Important Questions on Current Electricity

EASY
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 2 - Current Electricity>Objective Problems [ Level 1 ]>Q 25
Ohm-metre is the unit of
EASY
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 2 - Current Electricity>Objective Problems [ Level 1 ]>Q 26
The product of resistivity and conductivity of a cylindrical conductor depends on
MEDIUM
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 2 - Current Electricity>Objective Problems [ Level 1 ]>Q 27
The potential difference across a wire of 10-3 cm2 cross-sectional area and 50 cm length is 2 V, when a current of 0.25 A exists in the wire. The conductivity of the material is
MEDIUM
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 2 - Current Electricity>Objective Problems [ Level 1 ]>Q 28
The current-voltage graphs for a given metallic wire at two different temperatures T1 and T2T2>T1 would be:
MEDIUM
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 2 - Current Electricity>Objective Problems [ Level 1 ]>Q 29
For which of the following dependences of drift velocity vd on electric field E, is Ohm's law obeyed?
MEDIUM
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 2 - Current Electricity>Objective Problems [ Level 1 ]>Q 30
The temperature coefficient of resistance of a wire is 0.00125 perC∘. At 300 K its resistance is 1 Ω. The resistance of the wire will be 2 Ω at
EASY
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 2 - Current Electricity>Objective Problems [ Level 1 ]>Q 31
In the figure, a carbon resistor has bands of different colours on its body as mentioned in the figure. The value of the resistance is:
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EASY
JEE Advanced
IMPORTANT
Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 2 - Current Electricity>Objective Problems [ Level 1 ]>Q 32
Carbon resistors, used in electronic circuits are marked for their value of resistance and tolerance by a colour code. A given resistor has colour scheme brown, red, green and gold. Its value in ohm is: