×
Detail Form
We will send your result on your email id and phone no. please fill detail
1.
A copper disc of radius 
is rotated about its centre with 10 revolutions per second in a uniform magnetic field of 
with its plane perpendicular to the field. The e.m.f. induced across the radius of disc is
is rotated about its centre with 10 revolutions per second in a uniform magnetic field of with its plane perpendicular to the field. The e.m.f. induced across the radius of disc is
2.
In which of the following circuit is the current maximum just after the switch 
is closed
is closed
3.
O is the centre of two coplanar concentric circular conductors, A and B, of radii r and R respectively as shown in the figure. Here, r <<< R. the mutual inductance of the system of the conductors can be given by
4.
Two identical coaxial circular loops carry current 
each circulating in the clockwise direction. If the loops are approaching each other, then
each circulating in the clockwise direction. If the loops are approaching each other, then
5.
The core of a transformer is laminated to reduce
6.
In circular coil, when no. of turns is doubled and resistance becomes 
of initial, then inductance becomes
of initial, then inductance becomes
7.
Lenz's law is statement of
8.
A coil of area 
has 500 turns. Magnetic field of 
is perpendicular to the coil. The field is reduced to zero in 
. The induced e.m.f in the coil is
has 500 turns. Magnetic field of is perpendicular to the coil. The field is reduced to zero in . The induced e.m.f in the coil is
9.
Faraday's laws are consequence of conservation of
10.
Turn ratio is 1.25. The step up transformer operates at 230 V and current through secondary is 2 A. Then current in primary is