Two oppositely charged identical insulating spheres, each 54.0 c m in diameter a

Question

Two oppositely charged identical insulating spheres, each 54.0cm in diameter and carrying a uniform charge of magnitude 160?C , are placed 1.10m apart center to center (the figure (Figure 1) ).If a voltmeter is connected between the nearest points (a and b) on their surfaces, what will it read?

Two oppositely charged identical insulating spheres, each 54.0cm in diameter and carrying a uniform charge of magnitude 160?C , are placed 1.10m apart center to center (the figure (Figure 1) ).If a voltmeter is connected between the nearest points (a and b) on their surfaces, what will it read? How can you know this without any calculations?

Explanation / Answer

r1=d/2=54/2=27 cm

r2=1.1-0.27=0.83

V=Kq[1/r1 -1/r2)

V=(9*10^9)(160*10^-6)[1/0.27 -1/0.83]

Va=3.6*10^6 V

Vb=-3.6*10^6

V=Va-Vb =7.2*10^6 V

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