EASY
12th CBSE
IMPORTANT
Earn 100

Define the term drift velocity.

Important Questions on Current Electricity

EASY
12th CBSE
IMPORTANT
On the basis of electron drift, derive an expression for resistivity of a conductor in terms of number density of free electrons and relaxation time. On what factors does resistivity of a conductor depend ?
EASY
12th CBSE
IMPORTANT
Why alloys like constantan and manganin are used for making standard resistors ?
EASY
12th CBSE
IMPORTANT
Derive an expression for drift velocity of electrons in a conductor. Hence deduce Ohm's law.
EASY
12th CBSE
IMPORTANT

A wire whose cross-sectional area is increasing linearly from its one end to the other, is connected across a battery of $V$ volts. Which of the following quantities remains constant in the wire ?

drift speed

Justify your answer.

EASY
12th CBSE
IMPORTANT

A wire whose cross-sectional area is increasing linearly from its one end to the other, is connected across a battery of $V$ volts. Which of the following quantities remains constant in the wire ?Justify your answer.

EASY
12th CBSE
IMPORTANT

A wire whose cross-sectional area is increasing linearly from its one end to the other, is connected across a battery of $V$ volts. Which of the following quantities remains constant in the wire ?Justify your answer.

EASY
12th CBSE
IMPORTANT

A wire whose cross-sectional area is increasing linearly from its one end to the other, is connected across a battery of V volts. Which of the following quantities remains constant in the wire ?Justify your answer.

EASY
12th CBSE
IMPORTANT
Define the term potential gradient. Using this concept, explain the method for comparison of emfs of two primary cells using a potentiometer. Establish the relation used. Write two possible causes of potentiometer giving only one-sided deflection.