A 2.0 m long solenoid of cross sectional area 1.4 m² and 300 turns/m carries a current.It stores an energy of 3.4 J.What is the current in the solenoid?

Question

Quizplus · Accepted Answer

The energy stored in a solenoid is given by the formula $ U = \frac{1}{2} L I^2 $, where $ L = \mu_0 n^2 A l $ is the inductance. Solving for $ I $ using the given energy, length, area, and turns per meter, the current is approximately 4.6 A.

A 20 M Long Solenoid of Cross Sectional Area 1