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1.
A 100 turns coil shown in figure carries a current of 
in a magnetic field 
. The torque acting on the coil is
in a magnetic field . The torque acting on the coil is
2.
Two concentric coils each of radius equal to 
cm are placed at right angles to each other. 3 A and 4 A are the currents flowing in each coil respectively. The magnetic induction in 
at the centre of the coils will be 
cm are placed at right angles to each other. 3 A and 4 A are the currents flowing in each coil respectively. The magnetic induction in at the centre of the coils will be
3.
A thin circular wire carrying a current 
has a magnetic moment 
. The shape of the wire is changed to a square and it carries the same current. It will have a magnetic moment
has a magnetic moment . The shape of the wire is changed to a square and it carries the same current. It will have a magnetic moment
4.
Two parallel long wires carry currents 
and 
with 
. When the currents are in the same direction, the magnetic field midway between the wires is 
. When the direction of is reversed, it becomes 
. The ratio 
is
and with . When the currents are in the same direction, the magnetic field midway between the wires is . When the direction of is reversed, it becomes . The ratio is
5.
A straight wire of length 
is carrying a current of 
and the magnetic field due to it is measured at a point distance 
from it. If the wire is to be bent into a circle and is to carry the same current as before, the ratio of the magnetic field at its centre to that obtained in the first case would be
is carrying a current of and the magnetic field due to it is measured at a point distance from it. If the wire is to be bent into a circle and is to carry the same current as before, the ratio of the magnetic field at its centre to that obtained in the first case would be