Question 51 of 153
The source of time varying magnetic field may be
(A) a permanent magnet
(B) an electric field changing linearly with time
(C) direct current
(D) a decelerating charge particle
(E) an antenna fed with a digital signal
Choose the correct answer from the options given below.
Show answer and solution
Answer: (B) (D) only
An electric field varying linearly with time will not produce variable magnetic field as current will be constant.
A decelerating charged particle can result in a time varying magnetic field by emitting radiation.
Similarly a permanent magnet has a constant magnetic field and a direct current does not change its direction and cannot produce a magnetic field.
An antenna can modulate the digital signals .
So, the right option is the statement D.
A decelerating charged particle can result in a time varying magnetic field by emitting radiation.
Similarly a permanent magnet has a constant magnetic field and a direct current does not change its direction and cannot produce a magnetic field.
An antenna can modulate the digital signals .
So, the right option is the statement D.