Question

A potential difference V is applied to a conductor of length L,diameter D.How are the electric field E and resistance R affected when (a) V is doubled (b) L is doubled and (c) D is doubled ?

Answer 1

Electric field across a conductor is given by E=V/L hence if
@ V is doubled then E is also doubled
B. when l is doubled then the E is halved
C. As the electric field doesn't depend on diameter then it should be unchanged on changing diameter