1) A 2.4 cm x 2.4 cm parallel plate capacitor has a 1.8 mm gap spacing between the two plates. The strength of the electric field inside the capacitor is 1.25 x 105 N/C [or V/m). a) What is the strength (magnitude) of the electric field outside the plates? b) What is the potential difference across the capacitor? c) How much charge is on each plate?

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Chapter7: Electric Potential
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1) A 2.4 cm x 2.4 cm parallel plate capacitor has a 1.8 mm gap spacing between the
two plates. The strength of the electric field inside the capacitor is 1.25 x 105
N/C [or V/m].
a) What is the strength (magnitude) of the electric field outside the plates?
b) What is the potential difference across the capacitor?
c) How much charge is on each plate?
2) Dr. Thompson gave you the chore of building a 100 pF capacitor. The directions
are to take two square metal plates, with sides of length L, and place some
spacers in between the plates. The tiniest and thinnest spacer you could find is
0.2 mm thick. What must L be to build the capacitor?
3) You find a 9 V battery and connect two electrodes to it. You measure the charge
on each electrode to be +/- 45 nC. What is the capacitance of the electrodes?
4) Separated by 5 cm reside two positive charges. Provided the electric potential
energy is 72 micro-Joules, what is the magnitude of the force between the two
charges?
5) Your mom's electric hair dryer supports a current of 10 Amps. How much charge
and how many electrons flow through the hair dryer in the 3 minutes it takes
your mom to dry her hair?
6) While lightning is pretty to watch, it's best to not be part of the circuit. In a
lightning strike, what is the current if 2.4 C of charge flows in a flash of 0.17 ms?
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Transcribed Image Text:of 2 1) A 2.4 cm x 2.4 cm parallel plate capacitor has a 1.8 mm gap spacing between the two plates. The strength of the electric field inside the capacitor is 1.25 x 105 N/C [or V/m]. a) What is the strength (magnitude) of the electric field outside the plates? b) What is the potential difference across the capacitor? c) How much charge is on each plate? 2) Dr. Thompson gave you the chore of building a 100 pF capacitor. The directions are to take two square metal plates, with sides of length L, and place some spacers in between the plates. The tiniest and thinnest spacer you could find is 0.2 mm thick. What must L be to build the capacitor? 3) You find a 9 V battery and connect two electrodes to it. You measure the charge on each electrode to be +/- 45 nC. What is the capacitance of the electrodes? 4) Separated by 5 cm reside two positive charges. Provided the electric potential energy is 72 micro-Joules, what is the magnitude of the force between the two charges? 5) Your mom's electric hair dryer supports a current of 10 Amps. How much charge and how many electrons flow through the hair dryer in the 3 minutes it takes your mom to dry her hair? 6) While lightning is pretty to watch, it's best to not be part of the circuit. In a lightning strike, what is the current if 2.4 C of charge flows in a flash of 0.17 ms? MacBook Air DD 80 888 F10 F7 F8 F9 F4 F5 F6 F3 #3 $4 & ( 4 7 8 E R. Y U * 00
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