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.
The magnetic field due to a bar magnet along its perpendicular bisector varies as:
A.
1/r²
B.
1/r³
C.
1/r⁴
D.
1/r⁵
😑 View Answer Rough Work Error
ANSWER :
B. 1/r³
8.
Which of the following is a ferromagnetic substance?

NEET - 2023

A.
Aluminum
B.
Zinc
C.
Iron
D.
Copper
😑 View Answer Rough Work Error
ANSWER :
C. Iron
9.
The torque on a magnetic dipole in a uniform magnetic field is given by:
A.
τ = m × B
B.
τ = mB sinθ
C.
τ = mB cosθ
D.
τ = mB tanθ
😑 View Answer Rough Work Error
ANSWER :
B. τ = mB sinθ
10.
When a bar magnet is cut into two equal halves along its length, the pole strength of each piece:
A.
Remains the same
B.
Becomes half
C.
Becomes double
D.
Becomes zero
😑 View Answer Rough Work Error
ANSWER :
B. Becomes half
11.
The SI unit of magnetic dipole moment is:
A.
A.m²
B.
J/T
C.
N.m/T
D.
T.m²
😑 View Answer Rough Work Error
ANSWER :
A. A.m²
12.
When a bar magnet is heated, its magnetism

NEET - 2024

A.
Remains unchanged
B.
Increases
C.
Decreases
D.
Becomes infinite
😑 View Answer Rough Work Error
ANSWER :
C. Decreases