136 of 103 Wb passes through B no current through B If no

Last updated: 6/10/2023

136 of 103 Wb passes through B no current through B If no current passes through A and a current of 2 A passes through B then the flux through A is a 5 x 10 Wb b 4x10Wb c 5 10 Wb d 2 x 10 Wb 65 A pair of adjacent coils has a mutual inductance of 2 5 H If the current in one coil changes from 0 to 40 A in 0 8 s then the change in flux linked with the other coil is a 100 Wb c 200 Wb b 120 Wb d 250 Wb 66 If number of turns in primary and secondary coils is increased to two times each the mutual inductance a becomes 4 times b becomes 2 times c becomes times d remains unchanged a Honb n n L b Hona n n 1 c Mona n n L d Honb n n L 68 A 2 m long solenoid with diameter 2 cm and 2000 turns has a secondary coil of 1000 turns wound closely near its midpoint The mutual inductance between the two coils is a 2 4 x 10 H c 1 28 x 10 H b 3 9x 10 H d 3 14 10 H 69 A solenoid of length 30 cm with 10 turns per centimetre and area of cross section 40 cm completely surrounds another co axial solenoid of same length area of cross section 20 cm with 40 turns per centimetre The mutual inductance of the system is a 10 H c 3 mH b 8 H d 30 mH a 7 54 H c 9 54 H 71 Two conducting circular loops of radii R and are placed in the same plane with their cent coinciding If R R the mutual inductance between them will be directly proportional to a R R b c 2 2012 2n L a 72 A small square loop of wire of side I is placed inside a large square loop of wire of side L The loop are coplanar and their centres coincide What is the mutual inductance of the system a 2 2 Ho 12 of Wb A is a self inductance c magnetic flux mtG Objective NCERT P b 8 54 H d 10 54 H R R 67 A short solenoid of radius a number of turns per unit length and length L is kept coaxially inside a 73 The physical quantity which is measured in the unit very long solenoid of radius b number of turns per unit length n What is the mutual inductance of the system a 4 H c 3 H c b b 8 2 H1 TL 2 40 120 RL R R d 2 22 al 74 Two coils have self inductance L 4 mH and L 1 mH respectively The currents in the two cos are increased at the same rate At a certain instant of time both coils are given the same power If I and I are the currents in the two coils at that instant of time respectively then the value of b mutual inductance d both a and b b 2 H d 6 H d d 1 75 In a coil current falls from 5 A to 0 A in 0 2 s If an average emf of 150 V is induced then the self inductance of the coil is b N d N i 1 is 76 If N is the number of turns in a coil the value of self inductance varies as a no c increased by a increasing its area of cross section increasing its length b c increasing the current through it d increasing the number of turns in it 70 A circular coil with a cross sectional area of 4 cm has 10 turns It is placed at the centre of a long solenoid that has 15 turns cm and a cross sectional area of 10 cm as shown in the figure The axis of the 77 The self inductance of a long solenoid cannot be coil coincides with the axis of the solenoid What is their mutual inductance