For letter A:
Capacitance = Charge / Voltage
Capacitance = (50 x 10^-6) / 10
Capacitance = 5x10^-6 Farad
Capacitance = 5 uF <---answer in microfarad
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For letter B:
The capacitance wouldn't change even though the charge between the ornaments changed. The capacitance is only dependent with the area of the metal, distance between metals and the property of the dielectric material / vacuum / air.
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For letter C:
if the change changed to +200uC and -200uC
Voltage = Charge / Capacitance
Voltage = (200 x 10^-6) / (5x10^-6)
Voltage = 40 volts <---answer
Capacitance = Charge / Voltage
Capacitance = (50 x 10^-6) / 10
Capacitance = 5x10^-6 Farad
Capacitance = 5 uF <---answer in microfarad
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For letter B:
The capacitance wouldn't change even though the charge between the ornaments changed. The capacitance is only dependent with the area of the metal, distance between metals and the property of the dielectric material / vacuum / air.
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For letter C:
if the change changed to +200uC and -200uC
Voltage = Charge / Capacitance
Voltage = (200 x 10^-6) / (5x10^-6)
Voltage = 40 volts <---answer