20. The plates of an isolated parallel plate capacitor with a capachanar carry a

Question

20. The plates of an isolated parallel plate capacitor with a capachanar carry a charge Q. What is the capacitance of the capacitor t increased to 4Q? a) C/2 b) C/4 c) 4C d) 2C of the cr a the charge e) 21 . Capacitor B has one-half the capacitance of capacitor A. charge on capacitor A compare to that on Bwhen the two series to a battery for a long time? a) The charge on capacitor A is one-fourth the nta b) The charge on capacitor A is one-half the charge on capaciatactor c) The charge on capacitor A is the same d) T e) The How does the are connected in capacitor B capacitor B. he charge on capacitor A is twice the charge on capacitor B. charge on capacitor A is four times the charge on capacitor B. 22. Capacitor B has one-half the capacitance of capacitor A. How does the charge on capacitor A compare to that on B when the two are connected in parallel with a battery for a long time? a) Th b) The charge o c) The charge on capacitor A is the same as the charge on capacitor B. d) The charge on capacitor A is twice the charge on capacitor B e) The charge on capacitor A is four times the charge on capacitor B. e charge on capacitor A is one-fourth the charge on capacitor B. 23. When lightning strikes, the current flows from the ground upward to th clouds above. What is the direction of electrons flowing in the lightning? a) upward b) downward c) perpendicular to the current at each location on the lightning bolt d) parallel to the ground 24. When a potential difference is applied to a certain copper wire, a of 0.75 A passes through the wire. If the wire was removed from th and replaced with a copper wire of twice the diameter, what current flow through the new wire? Assume the wires are identical in all ot aspects a) 0.38 A b). 0.75 A c) 1.5 A d) 3.0 A e) 6.0 A

Explanation / Answer

here,

the capacitance of the capacitor is C

when the charge stored in the capacitor is incresed

but the area of plates and sepration remains the same

the capacitance of the capacitor is e) C

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