to a uniform held of 0 4 gauss second The A coil of is held

Last updated: 6/10/2023

to a uniform held of 0 4 gauss second The A coil of is held perpendicular The coil is turned through 180 in average induced emf is a 0 02 V b 0 04 V c 14 V d 0 08 V A long solenoid with 10 turns per cm has a small loop of area 3 cm placed inside normal to the axis of the solenoid If the current carried by the solenoid changes steadily from 2 A to 4 A in 0 2 s what is the induced voltage in the loop while the current is changing a 4 2 x 10 v c 7 3 x 10 V 10 b 4 V c e b 2 8 x 10 d 3 8 x 10 V V at a constant rate of 1 mm s The induced emf when the radius is 2 cm is a 2 V b V T d 2 V 12 An air cored solenoid with length 20 cm area of 17 A square loop of side 12 cm and resistance 0 60 2 is cross section 20 cm and number of turns 400 carries a current 2 A The current is suddenly switched off within 10 s The average back emf induced across the ends of the open switch in the circuit is ignore the variation in magnetic field near the ends of the c 3V d 5V placed vertically in the east west plane A uniform magnetic field of 0 10 T is set up across the plane in north east direction The magnetic field is decreased to zero in 0 6 s at a steady rate The magnitude of current during this time interval is a 1 42 10 A solenoid a 2 V c 3 41 x 10 A b 2 67 10 A d 4 21 10 A b le HV 16 A circular coil of radius 8 cm 400 turns and resistance 2 2 is placed with its plane perpendicular to the horizontal component of the earth s magnetic field It is rotated about its vertical diameter through 180 in 0 30s Horizontal component of earth magnetic field at the place is 3 x 10 T The magnitude of current induced in the coil is approximately a 4 10 A c 8 10 A b 8 x 10 A d 1 92 10 A 13 The magnetic flux through a coil perpendicular to its 18 A rectangular coil of 100 turns and size 0 1 mx 0 05 m plane and directed into paper is varying according to the relation 2 4t 6 mWb The emf induced in the loop at t 4 s is is placed perpendicular to a magnetic field of 0 1 T If the field drops to 0 05 T in 0 05 second the magnitude of the e m f induced in the coil is a 2 b 3 c 0 5 d 6 a 0 12 V b 2 4 V c 0 02 V d 1 2 V 14 A long solenoid S has turns per metre with 19 A uniform magnetic field B points vertically up diameter a At the centre of this coil we place a smaller coil of N turns and diameter b b a If the current in the solenoid increases linearly with time then the emf will be induced in the smaller coil Which of the following is the correct graph showing le verses t if current varies as a function of mr C and is slowly changed in magnitude but not in direction The rate of change of the magnetic field is a A conducting ring of radius r and resistance R is held perpendicular to the magnetic field and is totally inside it The induced current in the ring is a zero b ra c d 20 A magnetic field B is confined to a region r S a and points out of the paper the z axis r 0 being the centre of the circular region A charged ring charge q of radius b b a and mass m lies in the x y plane with its centre at the origin The ring is free to rotate and is at rest The magnetic field is brought to zero in time At The angular velocity to of the ring after the field vanishes is 9 Ba 2mb 2mb qBa 15 A conducting circular loop is placed in a uniform magnetic field B 0 025 T with its plane perpendicular to the loop The radius of the loop is a c 2rB R b d 9 Ba 2mb 9 Ba 2mb T R