Electromagnetic Induction

Q. A changing magnetic field induces a current in a closed loop. What is this phenomenon called?
  • A. Electromagnetic induction
  • B. Magnetic resonance
  • C. Electrolysis
  • D. Magnetism
Q. A circular loop is placed in a uniform magnetic field. If the loop is rotated about its diameter, what happens to the induced EMF?
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It becomes zero
Q. A coil of wire is placed in a changing magnetic field. What happens to the induced current if the resistance of the coil is increased?
  • A. Induced current increases
  • B. Induced current decreases
  • C. Induced current remains the same
  • D. Induced current becomes zero
Q. A coil of wire is placed in a magnetic field. If the magnetic field strength is doubled, what happens to the induced EMF?
  • A. It doubles
  • B. It remains the same
  • C. It halves
  • D. It quadruples
Q. A coil of wire is placed in a magnetic field. If the magnetic field strength is increased, what happens to the induced EMF in the coil?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
Q. A coil with 100 turns is placed in a magnetic field that changes at a rate of 0.5 T/s. What is the induced EMF in the coil?
  • A. 50 V
  • B. 100 V
  • C. 200 V
  • D. 25 V
Q. A coil with 100 turns is placed in a magnetic field that changes from 0.2 T to 0.5 T in 2 seconds. What is the induced EMF?
  • A. 15 V
  • B. 30 V
  • C. 5 V
  • D. 10 V
Q. A coil with 100 turns is placed in a magnetic field that changes from 0.5 T to 1.5 T in 2 seconds. What is the induced EMF?
  • A. 50 V
  • B. 100 V
  • C. 200 V
  • D. 400 V
Q. A loop of wire is moved into a magnetic field at a constant speed. What happens to the induced EMF as it enters the field?
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It becomes zero
Q. A loop of wire is moved into a magnetic field at a constant speed. What happens to the induced EMF as the loop enters the field?
  • A. Induced EMF increases
  • B. Induced EMF decreases
  • C. Induced EMF remains constant
  • D. Induced EMF becomes zero
Q. A loop of wire is moved into a magnetic field at a constant speed. What is the effect on the induced current as the loop enters the field?
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It becomes zero
Q. A loop of wire is moved into a uniform magnetic field at a constant speed. What happens to the induced EMF as it enters the field?
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It becomes zero
Q. A loop of wire is placed in a uniform magnetic field. If the angle between the field and the normal to the loop is 60 degrees, what is the effective magnetic flux?
  • A. 0.5 B A
  • B. 0.866 B A
  • C. 0.866 B A²
  • D. B A
Q. A loop of wire is placed in a uniform magnetic field. If the field strength is increased, what happens to the induced EMF?
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It becomes zero
Q. A magnetic field of 0.3 T is perpendicular to a circular loop of radius 0.1 m. What is the magnetic flux through the loop?
  • A. 0.03 Wb
  • B. 0.03 Tm²
  • C. 0.1 Wb
  • D. 0.1 Tm²
Q. A solenoid has a length of 1 m and a cross-sectional area of 0.01 m². If the magnetic field inside it is 0.4 T, what is the magnetic flux?
  • A. 0.004 Wb
  • B. 0.04 Wb
  • C. 0.4 Wb
  • D. 0.1 Wb
Q. A solenoid has a length of 1 m and a cross-sectional area of 0.01 m². If the magnetic field inside it is 0.2 T, what is the magnetic flux?
  • A. 0.002 Wb
  • B. 0.01 Wb
  • C. 0.02 Wb
  • D. 0.1 Wb
Q. A transformer operates on the principle of electromagnetic induction. If the primary coil has 100 turns and the secondary coil has 50 turns, what is the relationship between the primary and secondary voltages?
  • A. V_primary = 2 * V_secondary
  • B. V_primary = 0.5 * V_secondary
  • C. V_primary = V_secondary
  • D. V_primary = 4 * V_secondary
Q. A transformer operates on the principle of electromagnetic induction. What is the primary function of a transformer?
  • A. To increase voltage
  • B. To decrease voltage
  • C. To convert AC to DC
  • D. To store energy
Q. A transformer operates on the principle of electromagnetic induction. What is the main purpose of a transformer?
  • A. To increase or decrease voltage
  • B. To store electrical energy
  • C. To convert AC to DC
  • D. To measure current
Q. A transformer works on the principle of:
  • A. Electromagnetic induction
  • B. Electrostatics
  • C. Magnetic resonance
  • D. Thermal conduction
Q. According to Faraday's law, the induced EMF in a circuit is directly proportional to what?
  • A. The rate of change of magnetic flux
  • B. The strength of the magnetic field
  • C. The resistance of the circuit
  • D. The length of the conductor
Q. According to Faraday's law, the induced EMF in a circuit is proportional to what?
  • A. The rate of change of magnetic flux
  • B. The strength of the magnetic field
  • C. The resistance of the circuit
  • D. The length of the conductor
Q. If a coil with a resistance of 10 ohms has an induced EMF of 20 volts, what is the induced current?
  • A. 2 A
  • B. 0.5 A
  • C. 10 A
  • D. 20 A
Q. If a conductor is moved perpendicular to a magnetic field, what is the effect on the induced EMF?
  • A. It is maximized
  • B. It is minimized
  • C. It becomes zero
  • D. It fluctuates
Q. If a conductor moves through a magnetic field, what is the induced EMF dependent on?
  • A. The speed of the conductor and the strength of the magnetic field
  • B. The length of the conductor only
  • C. The temperature of the conductor
  • D. The type of material of the conductor
Q. If a magnetic field is applied perpendicular to a loop of wire, what is the effect on the induced EMF?
  • A. It is maximum
  • B. It is minimum
  • C. It is zero
  • D. It fluctuates
Q. If a magnetic field of 0.1 T is perpendicular to a circular loop of radius 0.1 m, what is the magnetic flux through the loop?
  • A. 0.01 Wb
  • B. 0.03 Wb
  • C. 0.1 Wb
  • D. 0.05 Wb
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 the magnetic field remains constant, how does the induced EMF change?
  • A. Doubles
  • B. Halves
  • C. Remains the same
  • D. Quadruples
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