Two flat surfaces are exposed to a uniform, horizontal magneticfield of magnitud

Question

Two flat surfaces are exposed to a uniform, horizontal magneticfield of magnitude 0.55 T. The first surface is tilted at an angleof 16° from the horizontal, and a net magnetic flux of 5.7 x10-4 Wb passes through it. The same net magneticflux passes through the secondsurface. (a) Determine the area of thefirst surface. (b)Find the smallest possiblevalue of the area of the second surface.

(a) Number   0.0037  Units m^2
(b) Number Units m^2
I need helpwith second part. Thanks for help.
(a) Number   0.0037  Units m^2
(b) Number Units m^2
I need helpwith second part. Thanks for help.

Explanation / Answer

Magnetic field B = 0.55 T

Angle = 16 degrees

Magnetic flux = 5.7 * 10 ^ -4 Wb

We know flux = BA cos ( 90- angle )

       From this Area A =flux / B cos ( 90 – 16 )

                                    = 3.7598 * 10 ^ -3 m ^ 2

(b). Smallest possible area A ‘ = flux / B

                                                 = 1.036 * 10 ^ -3 m ^ 2

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