A potential k q1/r12 exists at point Pdue to charge q1. The potential energy of the pair of charges is given by k,q192/*12: 12 91 91 Р Figure 24.8 (a) Charge q, estab- lishes an electric potential V, at point P. (b) Charge q, is brought from infinity to point P. 91 V = k, '12 92 b

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Chapter25: Electric Potential
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Problem 25.20P: At a certain distance from a charged particle, the magnitude of the electric field is 500 V/m and...
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As shown in 24.8b, take q2 to be a negative source charge and q1 to be a second charge whose sign can be changed. (i) If q1 is initially positive and is changed to a charge of the same magnitude but negative, what happens to the potential at the position of q1 due to q2? (a) It increases. (b) It decreases. (c) It remains the same. (ii) When q1 is changed from positive to negative, what happens to the potential energy of the two-charge system? Choose from the same possibilities.

A potential k q1/r12
exists at point Pdue to
charge q1.
The potential energy of
the pair of charges is
given by k,q192/*12:
12
91
91
Р
Figure 24.8 (a) Charge q, estab-
lishes an electric potential V, at
point P. (b) Charge q, is brought
from infinity to point P.
91
V = k,
'12
92
b
Transcribed Image Text:A potential k q1/r12 exists at point Pdue to charge q1. The potential energy of the pair of charges is given by k,q192/*12: 12 91 91 Р Figure 24.8 (a) Charge q, estab- lishes an electric potential V, at point P. (b) Charge q, is brought from infinity to point P. 91 V = k, '12 92 b
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