22. Direction of induced emf is determined by __________
A. Fleming’s left-hand rule
B. Fleming’s right-hand rule
C. Faraday’s law
D. Right-hand thumb rule
Answer: B
Fleming’s left-hand rule stated that if the index finger points toward magnetic flux, the thumb toward the motion of the conductor, then the middle finger points toward the induced emf.
23. “The direction of an induced e.m.f. is always such that it tends to set up a current opposing the motion or the change of flux responsible for inducing that e.m.f.”, this is the statement for?
A. Fleming’s left-hand rule
B. Fleming’s right-hand rule
C. Faraday’s law
D. Lenz’s law
Answer: D
According to Lenz’s law “The direction of an induced e.m.f. is always such that it tends to set up a current opposing the motion or the change of flux responsible for inducing that e.m.f.” It is used to determine the direction of the induced emf.
24. According to Fleming’s right-hand rule, the thumb points towards?
A. Current
B. E.M.F.
C. Motion of the conductor
D. Magnetic flux
Answer: C
Fleming’s left-hand rule stated that if the index finger points toward magnetic flux, the thumb toward the motion of the conductor, then the middle finger points toward the induced emf.
25. According to Fleming’s right-hand rule, the index finger points towards?
A. Current
B. E.M.F.
C. Motion of the conductor
D. Magnetic flux
Answer: D
Fleming’s left-hand rule stated that if the index finger points toward magnetic flux, the thumb toward the motion of the conductor, then the middle finger points toward the induced emf.
26. According to Fleming’s right-hand rule, the middle finger points toward the?
A. Current
B. E.M.F.
C. Motion of the conductor
D. Magnetic flux
Answer: B
Fleming’s left-hand rule stated that if the index finger points toward magnetic flux, the thumb toward the motion of the conductor, then the middle finger points toward the induced emf.
27. The relation between the direction of induced emf and the direction of motion of the conductor is?
A. Parallel
B. Equal
C. Not related
D. Perpendicular
Answer: D
According to Fleming’s right-hand rule, the induced emf, the motion of the conductor, and the magnetic flux are mutually perpendicular.
28. The relation between the direction of induced emf and the direction of magnetic flux is _______
A. Parallel
B. Equal
C. Not related
D. Perpendicular
Answer: D
According to Fleming’s right-hand rule, the induced emf, the motion of the conductor, and the magnetic flux are mutually perpendicular.
29. The relation between the direction of magnetic flux and the direction of motion of the conductor is _______
A. Parallel
B. Equal
C. Not related
D. Perpendicular
Answer: D
According to Fleming’s right-hand rule, the induced emf, the motion of the conductor, and the magnetic flux are mutually perpendicular.
30. Which, among the following, is the formula for induced emf?
A. e = dϕ /dt
B. e = dt/dϕ
C. e = t × ϕ
D. e = t2ϕ
Answer: A
The formula for induced emf is e = dϕ /dt because the induced emf is the flux linkage per unit time.
30. According to _________________ induced emf is equal to rate of change of magnetic flux.
A. Newton’s law
B. Lenz law
C. Faraday’s law
D. Coulomb’s law
Answer: C
According to Faraday’s law of electromagnetic induction, induced emf is equal to the rate of change of magnetic flux.
