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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
6.
A proton of energy 
is moving in a circular path in a uniform magnetic field. The energy of an alpha particle moving in the same magnetic field and along the same path will be
is moving in a circular path in a uniform magnetic field. The energy of an alpha particle moving in the same magnetic field and along the same path will be
7.
An electron and proton having same kinetic energy enter into magnetic field perpendicular to it. Then
8.
A coil of 
number of turns is wound tightly in the form of a spiral with inner and outer radii 
and 
respectively. When a current of strength is passed through the coil, the magnetic field at its centre is
number of turns is wound tightly in the form of a spiral with inner and outer radii and respectively. When a current of strength is passed through the coil, the magnetic field at its centre is
9.
A beam of protons is moving parallel to a beam of electrons. Both the beams will tend to
10.
A fixed horizontal wire carries a current of 
. Another wire having a mass per unit length 
is placed below the first wire at a distance of 
and parallel to it. How much current must be passed through the second wire if it floats in air without any support? What should be the direction of current in it
. Another wire having a mass per unit length is placed below the first wire at a distance of and parallel to it. How much current must be passed through the second wire if it floats in air without any support? What should be the direction of current in it