Electromagnetic Induction

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Q. According to Faraday's law, the induced electromotive force (emf) in a closed loop is proportional to what?
  • A. The area of the loop
  • B. The rate of change of magnetic flux
  • C. The resistance of the loop
  • D. The current in the loop
Q. If a conductor moves perpendicular to a magnetic field, what is the induced emf proportional to?
  • A. Speed of the conductor
  • B. Angle of movement
  • C. Length of the conductor
  • D. Both speed and length
Q. If the magnetic field strength is doubled, what happens to the induced emf in a loop moving through the field?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. If the magnetic field through a loop of wire is increasing, what is the direction of the induced current?
  • A. Clockwise
  • B. Counterclockwise
  • C. No current induced
  • D. Depends on the field strength
Q. In electromagnetic induction, what does the term 'flux linkage' refer to?
  • A. The product of magnetic field and area
  • B. The total magnetic flux through a coil
  • C. The induced emf in a circuit
  • D. The resistance of the coil
Q. What happens to the induced current if the magnetic field is removed?
  • A. It increases
  • B. It decreases
  • C. It reverses direction
  • D. It stops
Q. What is the effect of increasing the area of a loop in a uniform magnetic field on the induced emf?
  • A. Induced emf increases
  • B. Induced emf decreases
  • C. Induced emf remains the same
  • D. Induced emf becomes zero
Q. What is the formula for the induced electromotive force (emf) in a coil when the magnetic flux changes?
  • A. emf = -dΦ/dt
  • B. emf = F/q
  • C. emf = W/t
  • D. emf = mv^2/r
Q. What is the principle behind a transformer?
  • A. Conservation of energy
  • B. Electromagnetic induction
  • C. Ohm's law
  • D. Newton's laws
Q. What is the relationship between induced emf and the resistance of the circuit?
  • A. Induced emf is independent of resistance
  • B. Higher resistance leads to higher induced emf
  • C. Lower resistance leads to higher induced emf
  • D. Induced emf is inversely proportional to resistance
Q. Which law states that the direction of induced current is such that it opposes the change in magnetic flux?
  • A. Faraday's law
  • B. Lenz's law
  • C. Newton's first law
  • D. Ampere's law
Q. Which of the following factors does NOT affect the induced emf in a coil?
  • A. Number of turns in the coil
  • B. Rate of change of magnetic flux
  • C. Resistance of the wire
  • D. Strength of the magnetic field
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