Electromagnetic Induction

Q. If the area of a loop in a magnetic field is doubled while keeping the magnetic field strength constant, what happens to the magnetic flux?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. If the area of a loop is doubled while keeping the magnetic field constant, how does the magnetic flux change?
  • A. It remains the same
  • B. It doubles
  • C. It triples
  • D. It halves
Q. If the area of a loop is doubled while the magnetic field remains constant, how does the induced EMF change?
  • A. Doubles
  • B. Halves
  • C. Remains the same
  • D. Quadruples
Q. If the magnetic field through a loop is doubled while the area remains constant, what happens to the magnetic flux?
  • A. Magnetic flux doubles
  • B. Magnetic flux halves
  • C. Magnetic flux remains the same
  • D. Magnetic flux becomes zero
Q. If the magnetic field through a loop is increased uniformly, what happens to the induced current in the loop?
  • A. It flows in the direction of the magnetic field
  • B. It flows in the opposite direction to the magnetic field
  • C. It remains constant
  • D. It stops flowing
Q. If the magnetic field through a loop is increasing at a constant rate, what can be said about the induced current?
  • A. It is constant
  • B. It is increasing
  • C. It is decreasing
  • D. It is zero
Q. If the rate of change of current in an inductor is 2 A/s, what is the induced EMF if the inductance is 3 H?
  • A. 6 V
  • B. 3 V
  • C. 2 V
  • D. 1 V
Q. If the resistance of a circuit is 10 ohms and the induced EMF is 20 V, what is the induced current?
  • A. 2 A
  • B. 0.5 A
  • C. 10 A
  • D. 5 A
Q. If the resistance of a circuit is doubled while keeping the induced EMF constant, what happens to the induced current?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It becomes zero
Q. In a generator, if the speed of rotation is doubled, what happens to the induced EMF?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It becomes zero
Q. In a generator, mechanical energy is converted into electrical energy through the principle of:
  • A. Electrostatics
  • B. Electromagnetic induction
  • C. Thermodynamics
  • D. Optics
Q. In a generator, mechanical energy is converted into electrical energy through which process?
  • A. Electromagnetic induction
  • B. Thermal conduction
  • C. Photoelectric effect
  • D. Electrolysis
Q. In a generator, mechanical energy is converted into electrical energy through which principle?
  • A. Electromagnetic induction
  • B. Thermal conduction
  • C. Photoelectric effect
  • D. Capacitance
Q. In a generator, what is the role of the rotating coil in a magnetic field?
  • A. To create a magnetic field
  • B. To induce current
  • C. To store energy
  • D. To measure voltage
Q. In a transformer, if the primary coil has 200 turns and the secondary coil has 50 turns, what is the turns ratio?
  • A. 4:1
  • B. 1:4
  • C. 2:1
  • D. 1:2
Q. In a transformer, if the primary coil has 200 turns and the secondary coil has 50 turns, what is the relationship between the primary and secondary voltages?
  • A. Vp/Vs = 4
  • B. Vp/Vs = 0.25
  • C. Vp/Vs = 2
  • D. Vp/Vs = 1
Q. In a transformer, the ratio of the number of turns in the primary coil to the secondary coil determines what?
  • A. The voltage transformation ratio
  • B. The current transformation ratio
  • C. The power transformation ratio
  • D. The frequency of the output
Q. Lenz's law states that the direction of induced current is such that it opposes what?
  • A. The change in magnetic flux
  • B. The flow of electric current
  • C. The resistance in the circuit
  • D. The applied voltage
Q. What happens to the induced current in a closed loop if the magnetic field through the loop is increasing?
  • A. The induced current flows in a direction to oppose the increase
  • B. The induced current flows in the same direction as the increase
  • C. The induced current becomes zero
  • D. The induced current fluctuates
Q. What happens to the induced current in a coil if the magnetic field is suddenly removed?
  • A. Induced current continues to flow
  • B. Induced current stops immediately
  • C. Induced current increases
  • D. Induced current decreases gradually
Q. What happens to the induced current when the magnetic field is removed from a closed loop?
  • A. It continues to flow indefinitely
  • B. It stops immediately
  • C. It flows in the opposite direction
  • D. It decreases gradually
Q. What happens to the induced current when the magnetic field through a loop is increased?
  • A. The induced current flows in a direction to oppose the increase
  • B. The induced current flows in the same direction as the increase
  • C. The induced current becomes zero
  • D. The induced current fluctuates
Q. What happens to the induced EMF if the area of the coil is increased while the magnetic field strength remains constant?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
Q. What happens to the induced EMF if the area of the loop in a uniform magnetic field is doubled while keeping the magnetic field constant?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It becomes zero
Q. What happens to the induced EMF if the rate of change of magnetic flux is doubled?
  • A. It remains the same
  • B. It doubles
  • C. It halves
  • D. It quadruples
Q. What happens to the induced EMF if the speed of a conductor moving through a magnetic field is doubled?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. What is Lenz's law?
  • A. The direction of induced current opposes the change in magnetic flux
  • B. The induced current flows in the same direction as the change in magnetic flux
  • C. The induced EMF is always positive
  • D. The magnetic field is always perpendicular to the current
Q. What is self-inductance?
  • A. The ability of a coil to induce EMF in itself
  • B. The ability of a coil to induce EMF in another coil
  • C. The resistance of a coil to current flow
  • D. The capacitance of a coil
Q. What is self-induction?
  • A. Induction of EMF in a coil due to its own changing current
  • B. Induction of EMF in a coil due to an external magnetic field
  • C. Induction of current in a conductor due to a magnetic field
  • D. Induction of voltage in a capacitor
Q. What is the direction of the induced current when the magnetic field through a loop is increasing?
  • A. Clockwise
  • B. Counterclockwise
  • C. No current
  • D. Depends on the field strength
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