To measure capacitance using a reed switch

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To measure capacitance using a reed switch
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Set-up of apparatus
Parallel-plate capacitor
Vibrating reed switch
Signal generator
Light beam galvanometer
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Complete discharge of capacitance
Decay curve drops to zero in half cycle.
C. R. O. connected across resistor in series with
light beam galvanometer.
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Incomplete discharge of capacitance
Decay curve cannot drop to zero in half cycle.
C. R. O. connected across resistor in series with
light beam galvanometer.