A long solenoid has 800 turns per metre length of solenoid. A current of 1.6A flows through it. Calculate the magnetic field induced?
0.8 x 10-3 T
16 x 10-4 T
32 x 10-4 T
4 x 10-4 T
A coil of 1000 turns of wire is wound on a book and this book is lying on the table. The vertical component of earth's magnetic field is 0.6 x 10-4 T and the area of the coil is 0.05m2. The book is turned through 180o about a horizontal axis in 0.1 second. The average e.m.f. induced in the coil is :
0.03 V
0.06 V
zero
0.6 V
Energy in a current carrying coil is stored in the form of
electric field
magnetic field
dielectric strength
heat
The inductance of a coil is directly proportional to
its length
the number of turns
the resistance of the coil
the square of the number of turns
Two coils have a mutual inductance of 0.005 H. The current changes in the first coil according to the equation I = I0 sin ωt where I0 = 10A and ω = 100π rad/sec. The maximum value of e.m.f. in the second coil is
5π volts
2π volts
π volts
4π volts
A coil of resistance R and inductance L is connected to a battery of e.m.f. E volts. The final current in the coil is
The north pole of a long horizontal bar magnet is being brought closer to vertical conducting plane along the perpendicular direction. The induced current in the conducting plane is :
anticlockwise
clockwise
horizontal
vertical
What is the coefficient of mutual induction when the magetic flux changes by 2 x 10-2 Wb and corresponding change in current is 0.01A ?
3 H
0.5 H
2 H
A circuit has a self inductance of 1 H and carries a current of 2 A. To prevent sparking when the circuit is broken, a capacitor which can withstand 400 V is used. The capacitance of the capacitor is
25 μF
125 μF
100 pF
50 μF
A rectangular coil of 20 turns and area of cross-section 25 cm2 has a resistance of 100 Ω. If a magnetic field which is perpendicular to the plane of the coil changes at the rate of 1000 T per second, the current in the coil is
1 A
50 A
0.5 A
5 A
