hello sir,

we know v is directly proportional to q(charge)

but while calculating c(capacitance)

why q proportional to v is taken

Hi,

The cause for the appearence of charge q on the plates of a capacitor is the applied Voltage.

Thus, greater the applied voltage, greater is the charge that will appear on the Capacitor.

Hence we take q proportional to V

A proportional to B

is same as saying

B is proportional to A

All that matters is the linear Relationship between the two physical quantities.

Regards,

Rajat

Askiitian Expert