A uniform solenoid consists of three layers

PHYSICS · Single correct · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism

Problem

A uniform solenoid consists of three layers, each having 10 closely wound turns (total 30 turns). All layers initially carry a current of

2\,\text{A}

in the same sense. Later, the current in one entire layer is reversed while the other two layers remain unchanged. Which option correctly states the effect on the magnetic field inside the solenoid? (a) Direction unchanged; magnitude becomes

\dfrac{2}{3}

of the original value. (b) Direction unchanged; magnitude remains the same as the original value. (c) Direction unchanged; magnitude becomes

\dfrac{1}{3}

of the original value. (d) Direction reversed; magnitude becomes

\dfrac{1}{3}

of the original value.

Related theory

Fields due to Currents
Magnetic effect of current
The solenoid
Moving Charges and Magnetism

Browse the problem library