A solenoid long has a uniform cross-sectional area of

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

Problem

A solenoid

60\,\text{cm}

long has a uniform cross-sectional area of

4\,\text{cm}^2

. The first

30\,\text{cm}

contains

3000

turns, while the remaining

30\,\text{cm}

contains

6000

turns. The solenoid is air-cored and carries a current of

3\,\text{A}

. Estimate the total magnetic energy stored within the solenoid. (a)

0.17\,\text{J}

(b)

3.4\,\text{J}

(c)

0.34\,\text{J}

(d)

0.68\,\text{J}