Bar Magnet(equivalent solenoid, magnetic field lines,... ) NEET Questions

Physics - Magnetic Effects of Current and Magnetism

Bar Magnet(equivalent solenoid, magnetic field lines,... ) MCQ Questions


1.
A bar magnet is equivalent to which current-carrying device?
A.
A straight current-carrying wire
B.
A toroid
C.
A solenoid (finite length)
D.
A single circular loop
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ANSWER :
C. A solenoid (finite length)
2.
The magnetic moment of a bar magnet is:
A.
m = length / pole strength
B.
m = pole strength / length
C.
m = pole strength × area
D.
m = pole strength × length (m = qm × 2l)
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ANSWER :
D. m = pole strength × length (m = qm × 2l)
3.
For a bar magnet equivalent to solenoid of N turns carrying current I, area of cross-section A, the magnetic moment is:
A.
N/IA
B.
IA/N
C.
NI/A
D.
NIA
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ANSWER :
D. NIA
4.
Magnetic field on the axis of a bar magnet at distance r (r >> 2l, 2l = magnet length) is:
A.
B = (μ₀/4π)(2m/r³)
B.
B = (μ₀/2π)(m/r³)
C.
B = (μ₀/4π)(m/r²)
D.
B = (μ₀/4π)(m/r³)
😑 View Answer Rough Work Error
ANSWER :
A. B = (μ₀/4π)(2m/r³)
5.
Magnetic field on equatorial line of bar magnet at distance r (r >> 2l) is:
A.
Zero
B.
B = (μ₀/2π)(m/r³)
C.
B = (μ₀/4π)(2m/r³)
D.
B = (μ₀/4π)(m/r³)
😑 View Answer Rough Work Error
ANSWER :
D. B = (μ₀/4π)(m/r³)
6.
Ratio of axial to equatorial magnetic field of a bar magnet at same distance is:
A.
4 : 1
B.
2 : 1
C.
1 : 1
D.
1 : 2
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ANSWER :
B. 2 : 1