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At a certain location in the northern he...

At a certain location in the northern hemisphere, the earth.s magnetic field has a magnitude of `42 muT` and points downwards at `53^@` to the vertical. Calculate the flux through a horizontal surface of area `2.5 m^2. [sin 53^@ = 0.8]`

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`phi_(B)= BA cos theta = 42 xx 10^(-6) xx 2.5 xx cos 57^(@) Wb`
`=57.2 xx 10^(-6) Wb= 57.2 mu Wb`
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