Chapter 11: Electromagnetic Waves — Online MCQ Test
PHYSICS · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board
Practice Chapter 11: Electromagnetic Waves with a free chapter-wise online MCQ test.
This chapter covers: Focusing on electromagnetic theory this chapter covers displacement current electromagnetic wave spectrum production characteristics and applications across radio microwave infrare....
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Chapter 11: Electromagnetic Waves — Important Questions & Answers
Which current was introduced by Maxwell to modify Ampere's circuital law?
- A. Conduction current
- B. Displacement current
- C. Hall current
- D. Drift current
Answer: B. Displacement current
Maxwell introduced displacement current to account for changing electric fields and to make Ampere's law consistent.
Maxwell introduced displacement current to account for changing electric fields and to make Ampere's law consistent.
Electromagnetic waves are produced by:
- A. A stationary electric charge
- B. An accelerating charge
- C. A neutral body at rest
- D. A magnetic monopole
Answer: B. An accelerating charge
Accelerating charges produce time-varying electric and magnetic fields, which propagate as electromagnetic waves.
Accelerating charges produce time-varying electric and magnetic fields, which propagate as electromagnetic waves.
A time-varying electric field between the plates of a capacitor gives rise to:
- A. Only conduction current
- B. Displacement current
- C. No current
- D. Hall current
Answer: B. Displacement current
A changing electric field produces displacement current, which exists even in the region where no actual charge carriers move.
A changing electric field produces displacement current, which exists even in the region where no actual charge carriers move.
In Maxwell's correction, displacement current is introduced mainly to preserve the law of:
- A. Conservation of momentum
- B. Conservation of charge
- C. Conservation of energy
- D. Newton's third law
Answer: B. Conservation of charge
Displacement current ensures continuity of current and makes Ampere's law consistent with conservation of charge.
Displacement current ensures continuity of current and makes Ampere's law consistent with conservation of charge.
Which statement about electromagnetic waves is correct?
- A. Their electric field can exist without a magnetic field
- B. Their magnetic field is always zero in vacuum
- C. They can propagate in vacuum even without charges and currents present locally
- D. They are produced only by static charges
Answer: C. They can propagate in vacuum even without charges and currents present locally
Electromagnetic waves can travel through vacuum without requiring a material medium, and their fields sustain each other during propagation.
Electromagnetic waves can travel through vacuum without requiring a material medium, and their fields sustain each other during propagation.