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1.
A particle moving in a magnetic field increases its velocity then its radius of the circle
2.
A wire carrying current 
and other carrying 
in the same direction produces a magnetic field 
at the mid point. What will be the field when wire is switched off
and other carrying in the same direction produces a magnetic field at the mid point. What will be the field when wire is switched off
3.
Two long parallel copper wires carry currents of 
each in opposite directions. If the wires are separated by a distance of 
, then the force between the two wires is
each in opposite directions. If the wires are separated by a distance of , then the force between the two wires is
4.
An infinitely long straight conductor 
is fixed and a current is passed through it. Another movable straight wire 
of finite length and carrying current is held perpendicular to it and released. Neglect weight of the wire
is fixed and a current is passed through it. Another movable straight wire of finite length and carrying current is held perpendicular to it and released. Neglect weight of the wire
5.
Two similar coils of radius 
are lying concentrically with their planes at right angles to each other. The currents flowing in them are and , respectively. The resultant magnetic field induction at the centre will be
are lying concentrically with their planes at right angles to each other. The currents flowing in them are and , respectively. The resultant magnetic field induction at the centre will be
6.
A current 
carrying circular wire of radius is placed in a magnetic field perpendicular to its plane. The tension 
along the circumference of wire is
carrying circular wire of radius is placed in a magnetic field perpendicular to its plane. The tension along the circumference of wire is
7.
A current of 
ampere flows in a circular area of wire which subtends an angle of 
radian at its centre, whose radius is 
The magnetic induction at the centre is
ampere flows in a circular area of wire which subtends an angle of radian at its centre, whose radius is The magnetic induction at the centre is
8.
A wire in the form of a circular loop of one turn carrying a current produces a magnetic field at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is
at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is
9.
In which orientation the resultant magnetic moment of two magnets, will be zero, if magnetic moment of each magnets is 
in the following figures?
in the following figures?
10.
A square frame of side 1 m carries a current , produces a magnetic field at its centre. The same current is passed through a circular coil having the same perimeter as the square. The magnetic field at the centre of the circular coil is 
. The ratio 
' is
, produces a magnetic field at its centre. The same current is passed through a circular coil having the same perimeter as the square. The magnetic field at the centre of the circular coil is . The ratio ' is