A closed circuit of a resistor `R`, inductor of inductance `L` and a source of emf `E` are connected is series. If the inductance of the coil is abruptly decreaed to `L//4` (by removing its magnetic core), the new current immediately after this moment is (before decreasing the inductance the circuit is in steady state)

Options

A. zero
B. `(E)/(R )`
C. `4(E)/(R )`
D. `(E)/(4R)`

Answer

C

Explanation

Flux through a closed circuit containing an inductor does not change instantaneously.
`:. L((E)/(R )) = (L)/(4) (i) rArr I = (4E)/(R )`