QUESTION 1 Two positive point charges with q 1 = 1nC and q 2 = 9nC are a distanc
ID: 1784832 • Letter: Q
Question
QUESTION 1
Two positive point charges with q1 = 1nC and q2 = 9nC are a distance 1m apart in a vacuum.
The third negative point charge q3 = -1nC is placed between the two charges at the distance 25cm from q1 charge.
Which of these is correct for the magnitude and the direction of the force acting on the charge q3?
F= 1.3*10-6 N, pointed to q2 charge
F= 1.3*10-6 N, pointed upward
none of these
F= 1.3*10-6 N, pointed to q1 charge
3.24*10-7 N pointed to q1 charge
3.24*10-7 N pointed to q2 charge
F= 1.3*10-6 N, pointed upward
F=0 N
1.F= 1.3*10-6 N, pointed to q2 charge
2.F= 1.3*10-6 N, pointed upward
3.none of these
4.F= 1.3*10-6 N, pointed to q1 charge
5.3.24*10-7 N pointed to q1 charge
6.3.24*10-7 N pointed to q2 charge
7.F= 1.3*10-6 N, pointed upward
8.F=0 N
Explanation / Answer
electric force between two charges = k * q1 * q2 / r^2
electric force between q1 and q3 = 9 * 10^9 * 1 * 10^-9 * 1 * 10^-9 / 0.25^2
electric force between q1 and q3 = 1.44 * 10^-7 N
electric force between q2 and q3 = 9 * 10^9 * 9 * 10^-9 * 1 * 10^-9 / (1 - 0.25)^2
electric force between q2 and q3 = 1.44 * 10^-7 N
both the forces will act on opposite direction so,
net force on q3 = 1.44 * 10^-7 - 1.44 * 10^-7
net force on q3 = 0 N
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