# Capacitance, charge, area related physics questions

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1) A capacitor has a charge of 0.002C when it is connected across a 100V battery, Find its capacitance.

2) A capacitor has a capacitance of 6.40uF. How much charge must be removed to lower the potential difference of its plate by 50.0V?

3) The plates of a parallel-plate capacitor have areas of 40cm2 and are separated by 0.2mm of waxed paper (K=2.2). Find its capacitance.

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Three questions are answered in this posting.

1) A capacitor has a charge of 0.002C when it is connected across a 100V battery, Find its capacitance.

2) A capacitor has a capacitance of 6.40uF. How much charge must be removed to lower the potential difference of its plate by 50.0V?

3) The plates of a parallel-plate capacitor have areas of 40cm2 and are separated by 0.2mm of waxed paper (K=2.2). Find its capacitance.

Detail solutions are worked out with equations given.

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Capacitance

1. A capacitor has a charge of 0.002C when it is connected across a 100V battery, Find its capacitance.

Answer: 20uF

Solution:

You can use the equation:

C=Q/V

Where C is the capacitance in F, Q is the charge in C, V is the voltage in V.

C=Q/V

=0.002C/100V

=2×〖10〗^(-5) F

=20μF

2. A capacitor has a capacitance of 6.40uF. How much charge must be removed to lower the ...

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