Current Loop as a Magnetic Dipole and its Magnetic Dipole Moment NEET Questions

Physics - Magnetic Effects of Current and Magnetism

Current Loop as a Magnetic Dipole and its Magnetic Dipole Moment MCQ Questions


1.
The magnetic dipole moment of a current loop is defined as:
A.
m = qvr
B.
m = I/A
C.
m = IL (current × length)
D.
m = IA (current × area)
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ANSWER :
D. m = IA (current × area)
2.
The SI unit of magnetic dipole moment is:
A.
A/m²
B.
A·m
C.
Tesla·m²
D.
A·m²
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ANSWER :
D. A·m²
3.
The direction of magnetic dipole moment of a current loop is given by:
A.
Tangent to the loop
B.
Along the radius
C.
Right-hand thumb rule (perpendicular to loop plane)
D.
Along the current
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ANSWER :
C. Right-hand thumb rule (perpendicular to loop plane)
4.
For a current loop of N turns, the magnetic dipole moment is:
A.
IA
B.
I/(NA)
C.
NIA
D.
NI/A
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ANSWER :
C. NIA
5.
A circular loop of radius 5 cm carries a current of 2 A. Its magnetic dipole moment is:
A.
0.5 A·m²
B.
1.57 × 10⁻² A·m²
C.
3.14 × 10⁻² A·m²
D.
1 × 10⁻² A·m²
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ANSWER :
B. 1.57 × 10⁻² A·m²
6.
A current loop placed in a uniform magnetic field experiences:
A.
Only net force, no torque
B.
Both force and torque
C.
Only torque, no net force
D.
Neither force nor torque
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ANSWER :
C. Only torque, no net force