What is the electric field at r = 1/2 R? (L means that the direction is radially

Question

What is the electric field at r = 1/2 R? (L means that the direction is radially inward.) What is the electric field at r = 2R? What is the electric field at r = 2R? How would your answers change if the cl The answer to (a) would be zero. The answer to (b) would double. The answer to (b) would not change. The answer to (a) would double. The answer to (b) would be zero. The answer to (a) would not change. What is the electric field at r = 2R? How would your answers change if the c The answer to (a) would be zero. The answer to (b) would double. The answer to (b) would not change. The answer to (a) would double. The answer to (b) would be zero. The answer to (a) would not change. What is the electric field at r = 2ft? How would your answers change if the c The answer to (a) would be zero. The answer to (b) would double. The answer to (b) would not change. The answer to (a) would double. The answer to (b) would be zero. The answer to (a) would not change.

Explanation / Answer

a) Q enclosed = -2Q

so E = k *-2Q/(R/2)^2 = -8 k Q/R^2

they just want the magnitude so

8 k Q/R^2 inward

b) now Qenclosed = -2Q + Q = -Q

so E = k*-Q/(2R)^2 = - k Q/(4R^2)

so E = k Q/(4R^2) inwards

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