Not set 84.5/100 3/29/2017 o9:23 AM Gradebook Print Calculator Periodic Table Qu

Question

Not set 84.5/100 3/29/2017 o9:23 AM Gradebook Print Calculator Periodic Table Question 17 of 29 Incorrect Incorrect Incorrect Incorrect Sapling Learning Pictured on the right are two point charges Q --60.0 x10s C and Q2 100 x 105 C separated by a distance D 0300 m, as shown. Calculate the potential at point A positioned d-0.120 m to the left of Q Number 47.14 x 10 v Incorrect. Most likely you have an incorrect relationship between the potentials due to each individual charge or you have the wrong sign on Q O Previous ® Give Up & View Solution a Try Again 0 Next Exit

Explanation / Answer

Q1 = -60 * 10^-5 C

Q2 = 10 * 10^-6 C

the potential due to a point charge at distance r is

V = k * Q / r

the potential at point A due to Q1 is

V1 = k * Q1 / d

V1 = (9 * 10^9) * (-60 * 10^-5) / 0.3

V1 = - 18 * 10^6 V

the potential at point A due to Q2 is

V2 = k * Q1 / (D+d)

V2 = (9 * 10^9) * (10 * 10^-6) / (0.3+0.12)

V2 = 0.21 * 10^6 V

the total potential V = V1 + V2

V = - 17.79 * 10^6 V

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