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Let R = Z @ZeZ and S = {(a,b,c) € R|a+b=c}. Prove or
disprove that S is a subring of R.​

Answer 1

Answer:

1. A solid copper sphere, 10 cm in diameter is deprived of 1020 electrons by a charging scheme. The charge on the sphere is _________

a) 160.2 C

b) -160.2 C

c) 16.02 C

d) -16.02 C

Answer: c