# Unit of reluctance is: A) Henry B) Weber C) Weber/m2 D) (Henry)-1

By BYJU'S Exam Prep

Updated on: September 13th, 2023

The unit of Reluctance is (Henry)-1. The simple definition of magnetic reluctance is the property of any material that works to oppose the magnetic flux that is being created in the magnetic circuit. Magnetic reluctance is known as a magnetic insulator and magnetic resistance. There are many reluctance applications, signaling devices, transformers, recording devices, multi-media loudspeakers, electric clock timers, etc.

## Reluctance Unit and Formula

In an electrical circuit, the resistance dissipates the electric energy by opposing the flow of current in the circuit. The magnetic reluctance present in the magnetic circuit is consonant with the resistance in an electric circuit as it works to oppose the production of magnetic flux in a magnetic circuit. However, it does not give rise to energy dissipation, rather, it reserves magnetic energy.

### What is Reluctivity?

Reluctivity is a term that defines the amount of reluctance offered by a magnetic circuit of a unit length and a unit cross-section.

Magneto Motive Force (M.M.F)

M.M.F can be defined as a force establishing the flux through a magnetic circuit. It is equal to the product of the total current flowing through the coil and the number of turns of the coil.

Therefore, m.m.f= NI

The unit of Magneto Motive Force is ampere-turns (AT).

### Formula for Reluctance

The reluctance can be measured by using the following formula-

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