1
Question
A
closely wound solenoid of 800 turns and area of cross section
2.5 × 10−4
m2
carries a current of 3.0 A. Explain the sense in which the solenoid
acts like a bar magnet. What is its associated magnetic moment?
A closely wound solenoid of 800 turns and area of cross section 2.5 × 10−4 m2 carries a current of 3.0 A. Explain the sense in which the solenoid acts like a bar magnet. What is its associated magnetic moment?
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Solution
Number
of turns in the solenoid, n =
800
Area
of cross-section, A
= 2.5 ×
10−4
m2
Current
in the solenoid, I
= 3.0 A
A
current-carrying solenoid behaves as a bar
magnet because a magnetic field develops along its axis, i.e., along
its length.
The
magnetic moment associated with the given
current-carrying solenoid is calculated as:
M
= n I
A
=
800 ×
3 ×
2.5 ×
10−4
=
0.6 J T−1
Number of turns in the solenoid, n = 800
Area of cross-section, A = 2.5 × 10−4 m2
Current in the solenoid, I = 3.0 A
A current-carrying solenoid behaves as a bar magnet because a magnetic field develops along its axis, i.e., along its length.
The magnetic moment associated with the given current-carrying solenoid is calculated as:
M = n I A
= 800 × 3 × 2.5 × 10−4
= 0.6 J T−1
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