EASY
12th Uttar Pradesh Board
IMPORTANT
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Assertion: The resistance of a copper wire varies directly with the length and diameter.

Reason: Because the resistance varies inversely with the area of cross-section.

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Important Questions on Current Electricity

EASY
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Current Electricity>Exercise>Q 4
Assertion: Resistivity of conductor and semiconductors increases with temperature.

Reason: The electrons move with more kinetic energy and hence relaxation time decreases.
EASY
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Current Electricity>Exercise>Q 5
Assertion: The current density J→ at any point in the Ohmic resistor is in the direction of electric field E at that point.
Reason: A point charge when released from rest in a region having only electrostatic field always moves along electric lines of force.
EASY
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Current Electricity>Exercise>Q 6
A piece of resistance wire has resistance of 4Ω . It is doubled on itself. The new resistance will be,
EASY
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Current Electricity>Exercise>Q 7

From the following graph between V & I, calculate the resistance of the resistor.

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EASY
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Current Electricity>Exercise>Q 8
Write down the S.I. unit of current density.
MEDIUM
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Current Electricity>Exercise>Q 9
Write down the relation between conductivity and current density of a conductor.
MEDIUM
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Current Electricity>Exercise>Q 10

In the given figure, there are two similar cells whose EMFs are same and internal resistances are negligible. These cells are connected in parallel What is the value of current flowing through the resistance R?

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EASY
12th Uttar Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Current Electricity>Exercise>Q 11
When the shape of conductor is deformed then what is the effect on its resistance and resistivity?