Quiz for Electromagnetic Induction

Q1: Which law explains the production of induced emf in a coil due to change in magnetic flux?

A. Lenz’s Law B. Faraday’s First Law C. Ohm’s Law D. Kirchhoff’s Law

Q2: According to Lenz’s Law, the direction of induced current is such that it ______.

A. opposes the change in magnetic flux B. aids the change in magnetic flux C. is always clockwise D. is always anticlockwise

Q3: The SI unit of magnetic flux is:

A. Tesla B. Weber C. Henry D. Volt

Q4: Faraday’s second law states that the magnitude of induced emf is proportional to the:

A. square of magnetic flux B. number of turns in coil C. rate of change of magnetic flux D. current in the circuit

Q5: Which quantity is directly related to self-inductance?

A. Voltage B. Resistance C. Rate of change of current D. Magnetic field strength

Q6: If a magnet is pushed into a coil, an emf is induced due to:

A. Lenz’s Law B. Static Electricity C. Change in resistance D. Heating effect

Q7: A coil with 100 turns is placed in a magnetic field that changes by 0.02 Wb in 0.1s. The induced emf is:

A. 0.02 V B. 0.2 V C. 2 V D. 20 V

Q8: Which of the following does NOT affect the magnitude of induced emf in a coil?

A. Number of turns B. Strength of magnetic field C. Shape of coil D. Rate of change of flux

Q9: A current carrying conductor produces a magnetic field due to:

A. Electrostatics B. Moving charges C. Induction D. Resistance

Q10: Mutual induction occurs when:

A. a coil is rotated in a magnetic field B. a changing current in one coil induces emf in another C. two coils are connected in series D. magnetic field is static

Q11: The unit of self-inductance is:

A. Tesla B. Farad C. Henry D. Ohm

Q12: What is the emf generated if a 0.5 T magnetic field is reduced to 0 in 0.1 s through a loop of area 0.02 m²?

A. 0.1 V B. 0.2 V C. 0.05 V D. 1 V

Q13: What is the magnetic flux linked with a coil of 5 turns and magnetic field of 0.2 T through an area of 0.1 m²?

A. 0.1 Wb B. 0.05 Wb C. 0.01 Wb D. 0.2 Wb

Q14: Which device works on the principle of electromagnetic induction?

A. Transformer B. Voltmeter C. Ammeter D. Thermocouple

Q15: The induced current is maximum when:

A. magnetic field is constant B. flux changes rapidly C. area is small D. coil is open

Q16: In which of the following cases is the induced emf zero?

A. Magnet moves inside coil B. Flux remains constant C. Flux changes linearly D. Coil rotates in magnetic field

Q17: Lenz’s Law is a consequence of conservation of:

A. Energy B. Momentum C. Charge D. Mass

Q18: Which of the following will increase mutual inductance?

A. Increasing separation B. Using a dielectric core C. Using an iron core D. Decreasing turns

Q19: The emf induced in a coil is 5V and resistance is 10 ohm. The induced current is:

A. 0.5 A B. 2 A C. 0.05 A D. 10 A

Q20: What happens to induced current if coil area is doubled?

A. Doubles B. Becomes half C. No change D. Becomes zero