The presence of magnetic field can be determined using which one of the following instruments?

Concept:

• A magnetic needle is a piece of magnetized steel used as an indicator on the dial of a compass and in magnetic and electrical apparatus.
• In magnet, the north pole attracts the south pole and vice-versa.

Explanation:

• The presence of a magnetic field can be determined using a magnetic needle
• The In the presence of a magnetic field, the magnetic needle rests only in the direction of the magnetic field
• And in the absence of any magnetic field, the magnetic needle can rest in any direction.
• In the earth's magnetic field alone, the needle rest along the North-South direction.
• The magnetic needle used for detecting magnetic fields is a compass needle.

Additional Information

• An Ammeter is a measuring instrument used to measure the current in a circuit.
  • The ammeter is usually connected in series with the circuit
• A Voltmeter is an instrument used for measuring the electric potential difference between two points in an electric circuit.
  • The voltmeter is always connected in parallel with the circuit.
• A Motor is a machine that uses electric energy, to produce mechanical motion.