Get ready for better learning with NCERT & CBSE Electromagnetic Induction Worksheet Class 12 Physics. No need to roam anywhere we will provide you with all the study content you need. Let’s study smartly. PDF view is also there for your suitability.
Alternating Current Worksheet
1. When is the magnetic flux crossing a given surface area held in a magnetic field maximum ?
2. When is the flux linked with a closed coil held in a magnetic field zero ?
3. Name the SI units of (i) magnetic flux and (ii) magnetic induction (or magnetic flux density).
4. Write the dimensional formula of magnetic flux. [Punjab 99C]
5. Define weber. How is it related to Maxwell ?
6. State Faraday’s law of electromagnetic induction. [CBSE OD 09 ; F 09, 17]
7. A coil of metal wire is held stationary in a non- uniform magnetic field. Is any emf induced in the coil ?
8. On what factors does the magnitude of the emf induced in the circuit due to magnetic flux depend ? [CBSE F 13]
9. A wire cuts across a flux of 0.2 × 10-2Wb in 0.12 s. What is the emf induced in the wire ?
10. A metallic wire 1 m in length is moving normally across a field of 0.1 T with a speed of 5 ms-1. Find the emf between the ends of the wire. [ISCE 97]
11. How would you detect the presence of magnetic field on an unknown planet ?
12. When current flowing in an inductive circuit is switched off, will the induced current be in the direction of main current or in opposite direction ?
13. Give the expression for the emf induced between the ends of a metal conductor moving perpendicular to a uniform magnetic field. [CBSE D 93C]
14. A glass rod of length l moves with velocity v perpendicular to a uniform magnetic field B. What is the induced emf in the rod ?
15. A coil of area A is kept perpendicular in a uniform magnetic field B. If the coil is rotated by 180°, what will be the change in flux ?
16. A bicycle generator creates a 3.0 V, when the bicycle is travelling at a speed of 9.0 kmh-1. How much emf is general ed when the bicycle is travelling at a 15 kmh-1 ?
17. State the law that gives the polarity of the induced emf. [CBSE OD 09]
Or
State Lenz’s law. [CBSE D 13]
18. State the rule used to determine the direction of current induced in a conductor moving in a perpendicular magnetic field.
19. A magnet is moving towards a coil with a uniform speed v as shown in Fig. 6.106. State the direction of the induced current in the resistor R.
20. What is the direction of induced currents in metal rings 1 and 2 when current I in the wire is increasing steadily ? [CBSE OD 17]
21. Predict the direction of induced current in metal rings 1 and 2 when current I in the wire is steadily decreasing. (Fig. 6.108) [CBSE D 12]
22. Predict the direction of induced current in a metal ring when the ring is moved towards a straight conductor with constant speed v. The conductor is carrying current I in the direction shown in Fig. 6.109 [CBSE D 12]
23. Define the unit of self-inductance.
24. If the number of turns and the length of the solenoid are doubled keeping the area of cross-section same, how is the inductance affected ? [CBSE.PMT 93]
25. Two coils of self inductance L1 and L2 are connected in series, so that current flows in the same sense and they have a mutual inductance M. What is their equivalent inductance ?
26. If the number of turns of a solenoid is doubled, keeping the other factors constant, how does the self-inductance of the solenoid change ? [CBSE D 2000]
27. A coil of wire of certain radius has 600 turns and a self-inductance of 108 mH. What will be the self-inductance of another similar coil with 500 turns ?
28. Write three factors on which the self-inductance of coil depends. [CBSE OD 95]
29. What is meant by mutual induction ? [Himachal 98]
30. Define coefficient of mutual inductance for a pair of coils. [ISCE 98]
31. What is the unit of mutual inductance. [ISCE 96]
32. Define mutual inductance of one henry.
33. Two circular loops are placed with their centres separated by a fixed distance. How would you orient the loops to have (i) the largest mutual inductance and (ii) the smallest mutual inductance ?
34. Find the dimensions of mutual inductance.
35. What will be the dimensions of L/R, if L is inductance and R is resistance ?
36. Show that the SI unit of inductance, henry is equal to volt second per ampere. [ISCE 03]
37. When current in a coil changes with time, how is the back emf induced in the coil related to it?
38. Name any two useful application of eddy currents. [CBSE D 09, 16C ; F 16]
39. Define self-inductance. Give its SI units. [CBSE F 09, 16 ; D 17]
40. Define mutual inductance. Give its SI units. [CBSE F 09 ; D 16 ; OD 16]
41. How does the mutual inductance of a pair of coils change, when (i) distance between the coils is increased (ii) number of turns in each coil is increased ? [CBSE OD 13]
42. Figure 6.110 shows a current carrying sole-noid moving towards a conducting loop. Find the direction of the current induced in the loop.
43. An iron-cored solenoid has self-inductance 2.8 H. When the core is removed, the self inductance becomes 2 mH. What is the relative permeability of the core used ? [CBSE D 17C]