Q. 74.1( 18 Votes )
The amplitude of the magnetic field part of a harmonic electromagnetic wave in vacuum is B0 = 510 nT. What is the amplitude of the electric field part of the wave?
Given: Amplitude of magnetic field part of harmonic electromagnetic wave, B0 = 510 nT
Converting into Tesla, B0 = 510 × 10-9 T
Speed of light in vacuum, c = 3 × 108 m/s
Amplitude of the electric field part of the wave can be calculated by the following expression:
E = c B0
E = 3× 108ms-1 ×510 × 10-9 T
⇒ E = 153 N/C
Rate this question :
Which mode of propagation is used by short wave broadcast services ?Physics - Board Papers
Which basic mode of communication is used in satellite communication? What type of wave propagation is used in this mode? Write, giving reason, the frequency range used in this mode of propagation.Physics - Board Papers
(a) Why are infra-red waves often called heat waves ? Explain.
(b) What do you understand by the statement, ‘‘Electromagnetic waves transport momentum’’ ?Physics - Board Papers
A laser beam has intensity 2.5 × 1014 W m–2. Find the amplitudes of electric and magnetic fields in the beam.HC Verma - Concepts of Physics Part 2
Which of the following have zero average value in a plane electromagnetic wave?HC Verma - Concepts of Physics Part 2
Speed of electromagnetic waves is the sameHC Verma - Concepts of Physics Part 2
Consider the following two statements regarding a linearly polarized, plane electromagnetic wave:
(A) The electric field and the magnetic field have equal average values.
(B) The electric energy and the magnetic energy have equal average values.
HC Verma - Concepts of Physics Part 2
(a) Identify the part of the electromagnetic spectrum used in (i) radar and (ii) eye surgery. Write their frequency range.
(b) Prove that the average energy density of the oscillating electric field is equal to that of the oscillating magnetic field.
Physics - Board Papers
How is the speed of em-waves in vacuum determined by the electric and magnetic fields?Physics - Board Papers