Author: Study Clue

A metal wire shows non-linear V–I at high current mainly because A Carrier density changes B Area increases C Temperature

A conductor’s V–I graph bends upward at high current mainly due to A B. Decreased length B C. Increased area

A wire shows linear V–I graph only if its temperature remains A Increasing B Decreasing C Constant D Zero Explanation

Electric current in a circuit is defined as the rate of flow of A Electric field B Electric charge C

In a metal wire, electric current is mainly due to the motion of which charge carriers A Free electrons B

Two charges +q+q and −q−q are fixed at ±a±a on x-axis; the potential at origin is A Zero B kq/akq/a

Two point charges +q+q and +4q+4q are separated by distance rr; the force on +q+q is A kq2/r2kq2/r2 B 4kq2/r24kq2/r2

Two equal like charges are brought closer from rr to r/2r/2; the force becomes A Half B Double C Four

For a test charge qq placed at a point, the electric field E⃗E is defined as A Force times charge

Coulomb’s law gives force between two point charges mainly depends on A Product of charges B Sum of charges C