Physics · Current loop as a magnetic dipole and its magnetic dipole moment, bar magnet as an equivalent solenoid, magnetic field lines
An electromagnet:
An electromagnet:
- A. has its own persistent magnetic field
- B. acts as a magnet when an electric current passes through it
- C. both \( A \) and \( B \)
- D. none of the above
Step-by-step solution
An electromagnet produces a magnetic field only when an electric current flows through its coil. It does not have a persistent magnetic field on its own, unlike a permanent magnet. Therefore, option B is correct.
Related MCQs
- Magnetic field lines:…
- The drawn at any point on the magnetic lines of force gives direction of magnetic field at that point.…
- A bar magnet is dropped along the axis of copper ring held horizontally. The acceleration of fall is…
- Assertion An electric bell is a mechanical bell that functions by means of an electromagnet. When an electric current is applied, it produce…
- Current is flowing in a coil of area number of turns then magnetic moment of the coil is is equal to…