- Exam
- JEE Main
- Year
- 2023
- Date
- 13 April
- Shift
- Morning Shift
- Subject
- Physics
- Chapter
- Electromagnetic Induction
JEE Main 2023 · 13 April · Morning Shift · Physics · Electromagnetic Induction
The source of time varying magnetic field may be (A) a permanent...
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.
Options
- A(C) and (E) only
- B(D) only
- C(A) only
- D(B) and (D) only
Correct answer
B. (D) only
Step-by-step solution
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.