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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 mu T` 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 53^(@)= 63mu Wb`
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