Question

Which of the following instruments is used to measure magnetic field

• A. Thermometer
• B. Pyrometer
• C. Hygrometer
• D. Flux meter

Answer 1

The correct option is D

Flux meter

Explanation for Incorrect Options:

1. Thermometer is a device which is used to measure the temperature of an object
2. Pyrometer is a device which is specially made to measure very high temperatures like furnace and kilns
3. Hygrometer is a device which is used to measure the humidity of a gas or air.

Explanation of Correct Option:

1. Flux meter is a device which is used to measure the magnetic flux of a permanent magnet. And magnetic flux can be defined as the number of magnetic field lines crossing a given closed surface. More the magnetic flux, greater will be the magnetic field.

Hence, option (D) is the correct answer.