A hollow conducting sphere with inner radius a=1.0m and outer radius b=2.0m is shown in figure (Figure 1). Say a charge q=7.0nC is placed at the center of the sphere denoted by O. Here m denotes meter and 1nC denotes one nano coulomb or 1×10−9C. coulomb constant is k=8.987×109N⋅m2/C2. and r is the distance from the center. (a) Potential at r=a+b2 is, V=?volt Potential Give your answer up to at least three significance digits. (b) Electric Field at r=a+b2 is E(r)=?N/C Electric field Give your answer up to at least three significance digits (c) Magnitude of the electric Field at r=a2 is E(r)=?N/C Electric field Give your answer up to at least three significance digits.

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Q: 91 = +4.0 nC 92 = -6.5 nC 9 = -3.5 nC

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.