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## A coil consisting of 50 turns of wire is powered by a 9V battery. If the coil draws 1.5 A from the battery, what is the MMF, in ampere-turns

Question

A coil consisting of 50 turns of wire is powered by a 9V battery. If the coil draws 1.5 A from the battery, what is the MMF, in ampere-turns ?

A. 75 ampere-turns

B. 300 ampere-turns

C. 59 ampere-turns

D. 450 ampere-turns

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Physics
3 years
2021-08-07T08:37:18+00:00
2021-08-07T08:37:18+00:00 1 Answers
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## Answers ( )

A. 75 ampere-turnsExplanation:Given:

Number of turns, n = 50

Voltage, V = 9V

Current, I = 1.5A

MMF= ?

MMF is magnetomotive force.

MMF is independent on voltage and dependent on the number of turns and current in the wire.Thus, MMF can be written as:

On substituting the value we get:

MMF = 50 X 1.5

MMF = 75 ampere-turns