Physics
Assertion (A) : Current flows from body at higher potential to a body at lower potential.
Reason (R) : The direction of flow of electrons is from low potential body to a body at a higher potential.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Answer
both A and R are true and R is the correct explanation of A
Explanation
Assertion (A) is true because conventional current is defined to flow from higher potential to lower potential, even though actual charge carriers (electrons) move in the opposite direction.
Reason (R) is true because electrons are negatively charged, so they move from lower potential to higher potential opposite to the direction of conventional current.
The reason correctly explains why current flows from high to low potential because electrons, which actually move, go the opposite way.
Related Questions
Assertion (A) : Cotton and rubber are examples of insulators.
Reason (R) : These materials have a large number of free electrons and they offer less resistance to flow of current.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Assertion (A) : A thick wire offers less resistance in comparison to a thin wire.
Reason (R) : Resistance of wire is directly proportional to its area of cross-section.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Assertion (A) : Longer wires have greater resistance and the smaller wires have lesser resistance.
Reason (R) : Resistance of a wire increases with increase in temperature.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Two copper wires of equal length but different thickness are connected one by one to the same cell and bulb.
(a) In which wire will the rate of flow of the charge be greater? Give reason.
(b) Does a higher current mean that electrons move faster from the battery to the bulb?
(c) If current flows for a longer time, what happens to the charge passing per second? What happens to the total charge transferred?