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The airgap of a moving coil instrument is 2.0mm long and has a cross-sectional area of 500 mm. If the flux density is 50mT,

The airgap of a moving coil instrument is 2.0mm long and has a cross-sectional area of 500 mm. If the flux density is 50mT, determine the total energy stored in the magnetic field of the airgap

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