The Total solution for NCERT class 6-12
A closely wound solenoidof 800 turns and area of cross section 2.5 × 10−4 m2 carriesa current of 3.0 A. Explain the sense in which the solenoid acts like a barmagnet. What is its associated magnetic moment?
Number of turns in thesolenoid, n = 800
Area ofcross-section, A = 2.5 × 10−4 m2
Current in thesolenoid, I = 3.0 A
A current-carryingsolenoid behaves as a bar magnet because a magnetic field develops along itsaxis, i.e., along its length.
The magnetic momentassociated with the given current-carrying solenoid is calculated as:
M = n I A
=800 × 3 × 2.5 × 10−4
= 0.6 J T−1