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Measure that a parallel plate capacitor with 0.10 mm of vacuum between plates with an area...

Measure that a parallel plate capacitor with 0.10 mm of vacuum between plates with an area of  has a capacitance of 81 pF. You then measure that a long solenoid wound with 500 loops for every cm creates a magnetic field of 0.040 T if a current of 0.50 A is run through it.
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