EASY
12th CBSE
IMPORTANT
Earn 100

Is V=IR Ohm's law? Give correct form of Ohm's law.

Important Questions on Current Electricity

EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 23
When electrons drift in a metal from lower to higher potential, does it mean that all the free electrons of the metal are moving in the same direction?
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 24
How does the drift velocity of electrons in a metallic conductor vary with the increase in temperature?
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 25
If the temperature of a good conductor increases, how does the relaxation time of electrons in the conductor change?
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 26
A potential difference V is applied across a conductor of length l. How is the drift velocity affected when V is doubled and l is halved?
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 27
Two conducting wires X and Y of same diameter but different materials are joined in series across a battery. If the number density of electrons in X is twice that in Y, find the ratio of drift velocity of electrons in the two wires.
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 28
When we switch on an electric bulb, it lights up almost instantaneously though drift velocity of electrons in copper wires is very small. Give reason.
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 29
Of metals and alloys, which have greater value of temperature coefficient of resistance.
EASY
12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 30
Why alloys like constantan and manganin are used for making standard resistors.