Question

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Dimensions formula of magnetic flux is ___________

Answer 1

m^1 l^2 t^-2 a^-1 with unit wb (weber)

Answer 2

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Since magnetic field strength, B, can be defined as number of flux lines per area, it means that flux is B * Area.

B is usually found by measuring the force it exerts on a current carrying wire, so it’s units can be Newtons per Ampere*meter.

That makes the units of flux, Φ=B∗Area=NA∗m∗m2Φ=B∗Area=NA∗m∗m2.

Which is rather unwieldy, so the Weber, abbreviated Wb, was introduced.

The field strength of a magnet, B, is the number of Webersm2Webersm2.

This is more important when calculating the size of an induced voltage, which is dependent on the rate of change in the number of Webers. Voltage has units of Wb/s.