1.
The magnetic moment of a bar magnet is equal to
2.
The ratio of magnetic moment to angular momentum is called
3.
The magnetic field due to a short bar magnet at an axial point decreases as
4.
The magnetic field due to a short bar magnet at an equatorial point is
5.
A magnetic dipole is placed in a uniform magnetic field making an angle of 90° with the field. The torque acting on it is
6.
Which material is most suitable for making transformer cores?
7.
The hysteresis loop of a permanent magnet should have
8.
Retentivity is the ability of a material to
9.
Coercivity is defined as the magnetic field required to
10.
The magnetic susceptibility of a ferromagnetic substance is
11.
The magnetic permeability of vacuum is
12.
A bar magnet is cut into two equal halves perpendicular to its length. Each piece will have
13.
Assertion (A): Soft iron loses its magnetism quickly after removing the external magnetic field. Reason (R): Soft iron has low coercivity and low retentivity.
14.
Assertion (A): Steel is used to make permanent magnets. Reason (R): Steel has high retentivity and high coercivity.
15.
A diamagnetic substance placed in a non-uniform magnetic field moves toward
16.
Match the Columns: Column–I P. Retentivity Q. Coercivity R. Soft Iron S. Steel Column–II 1. Permanent magnets 2. Ability to retain magnetism 3. Low coercivity 4. Reverse magnetic field required Choose the correct matching.
17.
The magnetic moment of Earth is approximately
18.
Magnetic field lines inside a bar magnet are
19.
The energy of a magnetic dipole in a uniform magnetic field is maximum when the dipole is
20.
The SI unit of magnetic pole strength is
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