16. When the current changes from +2A to -2A in 0.05 second, an emf of 8 V is induced in a coil. The coefficient of self induction of the coil is (1) 0.1 H (2) 0.2 H (3) 0.4 H (4) 0.8 H 17. A 220 V input is supplied to a transformer. The output circuit draws a current of 2.0 A at 440 V. If the efficiency of the transformer is 80%, the current drawn by the primary winding of transformer is (1) 3.2 A (3) 4.4 A (2) 4.0 A (4) 5.0 A 18. In the given LCR circuit, the voltage across the terminals of the resistance and current flowing through it will be V 00000 R-502 400 V 400 V 100 V, 50 Hz (1) 400 V, 2A (2) 800 V, 2A (3) 100 V, 2A (4) 100 V, 4 A 19. In an ac circuit V and I are given by V 100 sin (100 t) volts I 100 sin (100 t+/3) mA The power dissipated in the circuit is (1) 2.5 watt (2) 5.0 watt (3) 10 watt (4) 104 watt 20. In Young's double slit experiment, if the screen is moved away from the plane of slits, then (1) Angular fringe width will decrease. (2) Angular fringe width will increase. (3) Angular fringe width will remain constant. (4) Angular fringe width first increases then decreases.