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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