Just as you touch a metal doorknob, a spark of electricity jumps from your hand
ID: 1400860 • Letter: J
Question
Just as you touch a metal doorknob, a spark of electricity jumps from your hand to the knob. The electric potential of the knob is 4.00×104 V greater than that of your hand. The work done by the electric force on the electrons that move from your hand to the knob is 2.50×10-7 J. How many electrons make the jump?
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An isolated metal sphere of radius 17.5 cm is at a potential of 3550 V. What is the charge on the sphere?
Determine the energy density of the electric field outside the sphere and integrate this throughout all space in order to calculate the total energy in the electric field.
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Two charged particles attract each other with a force of magnitude F=5.9 N. If the distance between the charges is made 3 times as large and the charge on one of the particles is made 3.7 times as big, what is the new force?
Explanation / Answer
you have asked 3 questions .As per guideline i can only answer one.i will solve second one for you.You can raise different questions for other one's.
r = Given =17.5=0.175m
V = Given=3550 V.
The potential for a point charge (which essentially what the sphere reduces to if one is outside the sphere) is
V=kq/r
q=rV/k
=0.175*3550 V./9*10^9
q=69.02*10^-9m
q=69.02nm--answer
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