Questions
1
The waves used by artificial satellites for communication is
Answer:microwaves
2
A charged particle oscillates about its mean equilibrium position with a frequency of 109 Hz. The frequency of electromagnetic waves produced by the oscillator is
Answer:109 Hz
3
Which of the following has/have zero average value in a plane electromagnetic wave?
Answer:Both magnetic and electric fields
4
Which of the following statement is false for the properties of electromagnetic waves?
Answer:Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of wave.
5
If a variable frequency ac source is connected to a capacitor then with decrease in frequency the displacement current will
Answer:decrease
6
Maxwell in his famous equations of electromagnetism introduced the concept of
Answer:displacement current
7
The ultra high frequency band of radio waves in electromagnetic wave is used as in
Answer:cellular phone communication
8
An electromagnetic wave can be produced, when charge is
Answer:both (b) and (c)
9
Which of the following electromagnetic waves is used in medicine to destroy cancer cells?
Answer:Gamma rays
10
The conduction current is same as displacement current when source is
Answer:either ac or dc
12
Choose the wrong statement?
Answer:Electromagnetic waves travel with the same speed in all media
13
The existence of EMW was experimentally established by :
Answer:Sir S. C. Bose
20
Which of the following laws was modified by Maxwell by introducing the displacement current?
Answer:Ampere’s law
Chapters
- Electric Charges & Fields
- Electrostatic potential and capacitance
- Electricity
- Moving charges and magnetism
- Magnetism and matter
- Electromagnetic induction
- Alternating current
- Electromagnetic waves
- Ray optics and optical instruments
- Wave optics
- Dual nature of radiation and matter
- Atoms
- Nuclei
- Semiconductor electronics
- Communication systems
