Q.1
How does the magnetic compass needle behave in a magnetic field?
Q.2
The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is
Q.3
Magnetising steel is normals difficult because
Q.4
The change of cross-sectional area of conductor in magnetic field will affect
Q.5
The direction of magnetic lines of force is
Q.6
Reciprocal of permeability is
Q.7
A certain amount of current flows through a ring shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil?
Q.8
One telsa is equal to
Q.9
The susceptibility of paramagnetic materials generally lies between
Q.10
The magnetic materials exhibit the property of magnetisation because of
Q.11
A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be
Q.12
Main causes of noisy solenoid are
Q.13
For which of the following materials the saturation value is the highest?
Q.14
Magnetic moment is a
Q.15
The materials are a bit inferior conductors of magnetic flux than air.
Q.16
Which of the following is the unit of magnetic flux density?
Q.17
Indicate which of the following material does not retain magnetism permanently.
Q.18
For a given wire-wound core, an increase in current through the coil
Q.19
In the left hand rule, forefinger always represents
Q.20
The most effective and quickest may of making a magnet from soft iron is by
Q.21
Gilbert is a unit of
Q.22
A magnetic field exists around
Q.23
What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m?
Q.24
Substances which have permeability less than the permeability of free space are known as
Q.25
A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?
Q.26
The magnetomotive force is
Q.27
The relative permeability is less than unity is case of
Q.28
The Biotsavart's law is a general modification of
Q.29
What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200?
Q.30
Materials subjected to rapid reversal of magnetism should have
0 h : 0 m : 1 s