lectromagnetic Induction K a c b 32 The north pole of a bar magnet is rapidly introduced into a solenoid at one end say A Which

Question

lectromagnetic Induction K a c b 32 The north pole of a bar magnet is rapidly introduced into a solenoid at one end say A Which of the following statements correctly depicts the phenomenon taking place No induced emf is developed a No d b The end A of the solenoid behaves like a south pole c The end A of the solenoid behaves like north pole d The end A of the solenoid acquires positive potential 33 An infinitely long cylinder is kept parallel to a uniform magnetic field B directed along positive z axis The direction of induced current on the surface of cylinder as seen from the z axis will be a clockwise of the positive z axis b anticlockwise of the positive z axis c zero d along the magnetic field 34 A conducting loop is placed in a uniform magnetic field with its plane perpendicular to the field An emf is induced in the loop if a it is rotated about its axis b it is rotated about a diameter c it is not moved d it is given translational motion in the field a one revolution 1 revolution c 35 When a wire loop is rotated in a magnetic field the direction of induced emf changes in every revolution b 1 2 d 2 revolution MOTIONAL ELECTROMOTIVE FORCE 36 A metallic square loop o ABCD is moving in its own plane with velocity vin a uniform magnetic e field perpendicular to its plane as shown in figure An electric field is induced 000 a in AD but not in BC in BC but not in AD b c d neither in AD nor in BC in both AD and BC 37 A conductor is moving with the velocity v in the magnetic field and induced current is I If the velocity of conductor becomes double the induced current will be a 0 5 I c 21 38 A circular coil expands radially in a region of magnetic field and no electromotive force is produced in the coil This is because a the magnetic field is constant b the magnetic f field is in the same plane as the circular coil and it may or may not vary c the magnetic field has a perpendicular to the plane of the coil component whose magnitude is decreasing suitably both b and c b 1 51 d 2 51 d 39 A jet plane is travelling west at the speed of 1600 km h The voltage difference developed between the ends of the wing having a span of 20 m if the earth s magnetic field at the location has a magnitude of 5 x 10T and the dip angle is 30 is a 4 1 V c 3 2 V 133 b 2 2 V d 3 8 V 40 A rectangular loop of sides 6 cm and 2 cm with a small cut is moving out of a region of uniform magnetic field of magnitude 0 4 T directed normal to the loop The voltage developed across the cut velocity of loop is 2 cm s in a direction normal to the longer side is a 3 8 x 10 v c 2 2 x 10 V a evB 41 In the question number 40 if velocity is normal in the shorter side then the voltage developed is a 2 3 x 10 V b 2 4 x 10 V c 4 8 x 10 V d 1 6 x 10 V 42 The figure shows a wire sliding on two parallel conducting rails placed at a separation 1 A magnetic field B exists in a direction perpendicular to the plane of the rails The force required to keep the wire moving at a constant velocity v will be b c Blv b 4 8 x 10 V d 3 2 x 10 V HoBv 4xl x xxx XL X X X d zero

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