28/03/2020Electromagnetic Induction(Senior Class Physics Study by Topics) 0Comments by Gate Academy Welcome to your Electromagnetic Induction(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. Two separate inductors of 50 and 150 mH respectively are mounted so that the mutual inductance inductance between them is 40 mH.What will be the resulting inductance if they are connected in series opposing 178 mH 24 mH 73 mH 120 mH2. Disregarding the effects of friction, a cyclist will coast farther when a lamp powered by a wheel generator is Of high wattage. None of these. Burned out. Of low wattage.3. The energy stored in an inductor of inductance 5mH when a current of 6A flows through it is 1¯−¹−² 1.8 x 10-² J 1.4 x 10-² J 1.4 x 10-² J 9.0 x 10-² J4. Transformers use ac so there will be the required Change in magnetic field for operation. Voltage for transformation. Change in input current. Transfer of energy from coil to coil.5. Which of following does not necessarily increase the size of the EMF induced when a magnetic north is placed into a coil Pulling the North out of the coil Moving the magnet faster Increasing the number of coils of wire6. The magnetic flux in a coil having 200 turns changes at the time rate of 0.08Wb/s. The induced emf in the coil is 1.6 V 25 V 250 V 16 V7. A metallic square Loop ABCD is moving in its own plane with velocity v in a uniform magnetic field perpendicular to its plane as shown in Fig. 4 (CF) .15. An electric field is induced Neither in AD nor in BC In both AD and BC AD, but not in BC In BC, but not in AD,8. A step-up transformer has a ratio of one to ten. Neglecting slight losses, if 100 W of power go into the primary coil, the power coming from the secondary coil is 1 W. 100 W. 10 W. 1000 W.9. A coil wire of a certain radius has 600 turns and a self-inductance of 108 mH. The self inductance of a second similar coil of 500 turns will be: 76 mH 74 mH 77 mH 75 mH10. The current in the primary coil of a transformer is 2.5A. If the coil has 50 turns and secondary 250 turns, calculate the current in the secondary coil. (Neglect energy loss in the transformer) 2.5 A 0.5 A 0.2A 5.0 A11. Alternating current can induce voltage because it has ripple value varying magnetic field stronger magnetic field than direct current high peak value12. Which of the following statements about magnetic field lines is not true? Magnetic field lines appear to end at the south pole of a magnet. Magnetic field lines form open or closed loops. Magnetic field lines appear to begin at the north pole of a magnet. Magnetic field lines have no beginning or end.13. The core of a transformer is laminated to Increase residual magnetism. Increase magnetic flux. Reduce eddy current losses. Increase strength of magnetic field.14. Which of the following devices in their common form would not function on a steady direct current electric bell filament lamp transformer electric heating elementA transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil. If the input voltage is 100 volts, the output voltage is15. To convert alternating current dynamo into a direct current dynamo, the slip rings are replaced with a split ring commutator number of the turns in the coil is increased strength of the field magnet is increased16. A coil of 4H and resistance 2 ohms carries a steady current of 2A. Calculate the energy stored 3J 1J 4J 8J17. The power loss is less in transmission lines when Both voltage and current are less Voltage is less but current is more Both voltage and current are more Voltage is more but current is less18. The principle of operation of an induction coil is based on Faraday's law Coulomb's law Ampere's law Ohm's law19. A 10 V battery of negligible internal resistance is switched across a coil of 1H inductance and 40 ohm resistance Find the initial current 0 A 1.25 A 1 A 0.25 A20. A primary winding of a transformer has 400 turns and its secondary has 100 turns. If a source of emf for 12 V is applied to the primary, the secondary emf will be 48 V 3 V 6 V 24 V21. What is the basic argument which is needed to derive EMF= Blv The impulse of the electron is equal to its momentum change The electric force on the electron is greater than the magnetic force on the electron The electric force on the electron is less than the magnetic force on the electron The electric force on the electron is equal to the magnetic force on the electron22. A 10 V battery of negligible internal resistance is switched across a coil of 1H inductance and 40 ohm resistance Find the final current 0 A 0.25 A 1.25 A 1 A23. Electromagnetic induction is not used in ? Room heater AC generator Transformer Choke coil24. When a wire loop is related in a magnetic field the direction of included EMF change once in each. 2 revolution 1 revolution ½ revolution ¼ revolution26 out of 25Time is Up!