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1.
Two circular coils are made of two identical wires of same length. If the number of turns of two coils are 4 and 2, then the ratio of magnetic induction at centres will be zero
2.
A long, straight wire is turned into a loop of radius 
(see figure). If a current of 8 amperes is passed through the lop, then the value of the magnetic field and its direction as the centre 
of the loop shall be close to
(see figure). If a current of 8 amperes is passed through the lop, then the value of the magnetic field and its direction as the centre of the loop shall be close to
3.
Net magnetic field at the centre of the circle O due to a current through a loop as shown in figure (
4.
Which of the following while in motion cannot be deflected by magnetic field?
5.
A charged particle of mass 
and charge 
describes circular motion of radius 
in a uniform magnetic field of strength 
. The frequency of revolution is
and charge describes circular motion of radius in a uniform magnetic field of strength . The frequency of revolution is