Chapter 22, Problem 069 Your answer is partially correct. Try again. Two particl

Question

Chapter 22, Problem 069 Your answer is partially correct. Try again. Two particles, each with a charge of magnitude 12.3 nc, are at two of the vertices of an equilateral triangle with edge length 3.8 m. What is the magnitude of the electric field at the third vertex if (a) both charges are positive and (b) one charge is positive and the other is negative? (a) Number T.ooo0001633 (b) Number Lo000000943 Answer * 1: the tolerance is +/-2% /C or V/m Answer * 2: the tolerance is +/-2% Question Attempts: Unlimited

Explanation / Answer

a)

When both charges are positive,

Enet = 2E*cos(30 deg)

where, E = k*q/r^2

So, E = 9*10^9*(12.3*10^-9)/(3.8^2)

= 7.67 N/C

So, Enet = 2*7.67*cos(30 deg)

= 13.28 N/C <-------answer

b)

Wen one of them is negative,

Enet = 2*E*cos(60 deg)

=  2*7.67*cos(60 deg)

= 7.67 N/C <---------- answer

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