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Electromagnetic Induction EXERCISES Solutions
- Q6.1(a): Predict the direction of induced current in the situation described by the following Fig. 6.15(a).
- Q6.1(b): Predict the direction of induced current in the situation described by the following Fig. 6.15(b).
- Q6.1(c): Predict the direction of induced current in the situation described by the following Fig. 6.15(c).
- Q6.1(d): Predict the direction of induced current in the situation described by the following Fig. 6.15(d).
- Q6.1(e): Predict the direction of induced current in the situation described by the following Fig. 6.15(e).
- Q6.1(f): Predict the direction of induced current in the situation described by the following Fig. 6.15(f).
- Q6.2(a): Use Lenz’s law to determine the direction of induced current in the situations described by Fig. 6.16: A wire of irregular shape turning into a circular shape;
- Q6.2(b): Use Lenz’s law to determine the direction of induced current in the situations described by Fig. 6.16: A circular loop being deformed into a narrow straight wire.
- Q6.3: A long solenoid with 15 turns per cm has a small loop of area (2.0 cm^{2}) placed inside the solenoid normal to its axis. If the current carried by the solenoid changes steadily from 2.0 A to 4.0 A in 0.1 s, what is the induced emf in the loop while the current is changing?
- Q6.4(a): A rectangular wire loop of sides 8 cm and 2 cm with a small cut is moving out of a region of uniform magnetic field of magnitude 0.3 T directed normal to the loop. What is the emf developed across the cut if the velocity of the loop is (1 cm s^{-1}) in a direction normal to the longer side of the loop? For how long does the induced voltage last in each case?
- Q6.4(b): A rectangular wire loop of sides 8 cm and 2 cm with a small cut is moving out of a region of uniform magnetic field of magnitude 0.3 T directed normal to the loop. What is the emf developed across the cut if the velocity of the loop is (1 cm s^{-1}) in a direction normal to the shorter side of the loop? For how long does the induced voltage last in each case?
- Q6.5: A 1.0 m long metallic rod is rotated with an angular frequency of (400 rad s^{-1}) about an axis normal to the rod passing through its one end. The other end of the rod is in contact with a circular metallic ring. A constant and uniform magnetic field of 0.5 T parallel to the axis exists everywhere. Calculate the emf developed between the centre and the ring.
- Q6.6(a): A horizontal straight wire 10 m long extending from east to west is falling with a speed of (5.0 m s^{-1}), at right angles to the horizontal component of the earth’s magnetic field, (0.30 \times 10^{-4} Wb m^{-2}). What is the instantaneous value of the emf induced in the wire?
- Q6.6(b): A horizontal straight wire 10 m long extending from east to west is falling with a speed of (5.0 m s^{-1}), at right angles to the horizontal component of the earth’s magnetic field, (0.30 \times 10^{-4} Wb m^{-2}). What is the direction of the emf?
- Q6.6(c): A horizontal straight wire 10 m long extending from east to west is falling with a speed of (5.0 m s^{-1}), at right angles to the horizontal component of the earth’s magnetic field, (0.30 \times 10^{-4} Wb m^{-2}). Which end of the wire is at the higher electrical potential?
- Q6.7: Current in a circuit falls from 5.0 A to 0.0 A in 0.1 s. If an average emf of 200 V induced, give an estimate of the self-inductance of the circuit.
- Q6.8: A pair of adjacent coils has a mutual inductance of 1.5 H. If the current in one coil changes from 0 to 20 A in 0.5 s, what is the change of flux linkage with the other coil?
Chapters in CBSE - Class 12 Physics
- Electric Charges and Fields
- Electrostatic Potential and Capacitance
- Current Electricity
- Moving Charges and Magnetism
- Magnetism and Matter
- Alternating Current
- Electromagnetic Waves
- Ray Optics and Optical Instruments
- Wave Optics
- Dual Nature of Radiation and Matter
- Atoms
- Nuclei
- Semiconductor Electronics
- Communication Systems
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