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I've been set the following which I think I've got correct, but not 100%. Am I right in calculating the area in m

^{2}?

## Homework Statement

2. A rectangular coil measuring 20mm by 35mm and having 650 turns is rotating about a horizontal axis which is at right angles to a uniform magnetic field of flux density 2.5x10-3T. The plane of the coil makes an angle θ with the vertical, as shown in the diagrams.

(i) State the value of θ when the magnetic flux through the coil is a minimum.

(ii) Calculate the magnetic flux passing through the coil when θ is 30o.

(iii) What is the maximum flux linkage through the coil as it rotates?

## Homework Equations

ΔΦ=NBAsinθ

## The Attempt at a Solution

i) Φ is at a minimum when θ=0

ii) ΔΦ=650x(2.5x10

^{-3})x(0.002x0.0035)sin30

=1.365x10

^{-5}sin30

=5.6875x10

^{-6}Wb

iii) Flux linkage is maximum when θ=90

ΔΦ=1.375x10

^{-5}sin90

=1.375x10

^{-5}Wb

Thanks,