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


7.
Magnetic field lines of a bar magnet:
A.
Only exist outside the magnet
B.
Start from south pole to north pole (externally)
C.
Cross each other at magnetic equator
D.
Start from north pole and end at south pole (externally)
😑 View Answer Rough Work Error
ANSWER :
D. Start from north pole and end at south pole (externally)
8.
Which of the following is TRUE about magnetic field lines?
A.
They are always straight
B.
They form closed loops (never start or end)
C.
They begin at positive charges
D.
They can intersect
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ANSWER :
B. They form closed loops (never start or end)
9.
The density of magnetic field lines at a point represents:
A.
The charge present
B.
The strength (magnitude) of magnetic field there
C.
The current flowing
D.
The mass of iron filings nearby
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ANSWER :
B. The strength (magnitude) of magnetic field there
10.
Two magnetic field lines cannot intersect because:
A.
They emanate from north pole
B.
They are parallel always
C.
At the point of intersection, the magnetic field would have two directions, which is impossible
D.
They are straight
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ANSWER :
C. At the point of intersection, the magnetic field would have two directions, which is impossible
11.
A tangent to magnetic field line at any point gives:
A.
Both magnitude and direction
B.
Direction of magnetic field B at that point
C.
Neither
D.
Magnitude of B at that point
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ANSWER :
B. Direction of magnetic field B at that point
12.
The axial field of a bar magnet with moment 2 A·m² at distance 10 cm (r >> 2l) is:
A.
2 × 10⁻⁴ T
B.
4 × 10⁻³ T
C.
4 × 10⁻⁴ T
D.
4 × 10⁻⁵ T
😑 View Answer Rough Work Error
ANSWER :
C. 4 × 10⁻⁴ T