Download Problems – Potential Difference

Physics 40S
Problems – Potential Difference
1. If 4.00 x 1010 electrons travel from the negative to the positive terminal of a 6 volt
battery:
a) How many coulombs of charge flow?
b) How much energy could be supplied?
2. If 6.00 x 1014 electrons travel from the negative to the positive terminal of a 12.0 volt
battery:
a) How many coulombs of electric charge flow?
b) How much work could be done by this much electric charge?
3.
If 3.15 Joules of work are done in moving 0.35 C of charge between the
plates, what is the potential difference across the plates? (i.e. what is the
voltage of the battery the plates are connected to?)
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4.
If a battery does 1.80 x 10-5 Joules of work in moving a charge of
1.50 x 10-6 C between the plates, what is the voltage of the battery?
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5. How much work is done in moving 1.2 x 10-2 C of charge between two plates whose
Potential difference is 6.00 volts?
6. How much work is done in transporting 0.40 C of charge between two plates, which
are connected, to a 5000 volt source?
7.
6 Volts
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0.2 m
Two plates have a potential difference of 6.00 volts and
are 20 cm (.20 m) apart. If .15 C
of electric charge is moved between the plates, find:
a)
amount of work done in moving the charge
b)
force exerted on the charge
c)
electric field strength (2 ways)
Physics 40S
8.
200 Volts
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Potential difference between the plates is 200 volts, and
they are 8.00 mm apart. If 2 x 10-6 C of electric charge
is moved between the plates, find:
a) amount of work done in moving the charge
b)force exerted on the charge
c) electric field strength (2ways)
8 mm
9. The two horizontal parallel plates of a vacuum tube are 2.00 cm apart and connected
across 120 volts. Find:
a) the electric field strength, E, in the space between the plates.
b) the electrical force, F, acting on an electron (q = 1.60 x 10-19 C) in the space
between the plates.
c) The energy, W, gained by an electron in travelling 2.00 cm from cathode to
anode.
10.
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An object of charge 1.6 x 10-6 C has a force of 4.00 x
10-2 N exerted on it when located between two charged
plates as shown. Find:
a)
work done on the charge when it moves from the
positive to the negative plate
b)
electric field strength
c)
voltage applied to the plates (2 ways)
20 cm
11.
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20 cm
An object of charge 4.50 x 10-6 C has a force of 9.00 x
10-3 N exerted upon it when located between two
charged plates as shown. Find:
a) work done on the charge as it moves from the
positive to the negative plate
b) electric field strength
c) voltage applied to the plates (2 ways)
Physics 40S
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12.
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Fe
An alpha particle of mass 6.68 x 10-27 kg and charge
6.40 x 10-19 C is suspended between 2 plates separated
by a distance of 2.00 cm. Find:
a) Fe exerted on the charged particle
b) electric field strength
c) voltage applied to the plates
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Fg
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Fe
A hydrogen (H+) of mass 1.67 x 10-27 kg and charge of
1.60 x 10-19 C is suspended between 2 plates which are
separated by a distance of 1.50 cm. Find:
a) Fe exerted on the ion
b) electric field strength
c) voltage applied to the plates
14. A charged particle of mass 4.00 x 10-14 kg is suspended between 2 charged plates
separated by a distance of 2.50 cm, and with a potential difference of 500 V. Find:
a) electric field strength
b) Fe exerted on the particle
c) Charge on the particle
15. A charged particle of mass 6.00 x 10-13 kg is suspended between 2 charged plates
separated by a distance of 2.00 cm, and with a potential difference of 250 volts.
Find:
a) electric field strength
b) Fe exerted on the particle
c) Charge on the particle
Physics 40S
ANSWERS
PROBLEMS – POTENTIAL DIFFERENCE
1. a) 6.40 x 10-9 C
c) 3.84 x 10-8 J
2. a) 9.60 x 10-5 C
c) 1.15 x 10-3 J
3. 9.00 V
4. 12 V
5. 7.20 x 10-2 J
6. 2000 J
7. a) 0.90 J
b) 4.5 N
c) 30.0 N/C
8. a) 4.00 x 10-4 J
b) 0.05 N
c) 25 000 N/C
9. a) 6000 N/C
b) 9.60 x 10-16 N
c) 1.92 x 10-17 J
10. a) 8.00 x 10-3 J
b) 25 000 N/C
c) 5 000 V
11. a) 1.80 x 10-3 J
b) 2 000 N/C
c) 400 V
12. a) 6.55 x 10-26 N
b) 1.02 x 10-7 N/C
c) V = 2.05 x 10-9 V
13. a) 1.64 x 10-26 N
b) 1.02 x 10-7 N/C
c) 1.53 x 10-9 V
14. a) 20 000 N/C
b) 3.92 x 10-13 N
c) 1.96 x 10-17 C
15. a) 12 500 N/C
b) 5.88 x 10-12 N
c) 4.7 x 10-16 C