QI) The force between two identical charges separated by 1 cm is equal to 90 mag
ID: 1772980 • Letter: Q
Question
QI) The force between two identical charges separated by 1 cm is equal to 90 magnitude of the two charges? (Answer: as±1.00x10°Coulombs) Q2) Imagine 3 charges, separated in an equilateral triangle as shown abo q = 1.0 nC. What is the magnitude and direction of the force felt by the upper (Answer: 7. 8x105 (N), down) Q3) Three point charges are in a st N. What is the ve, with L-2.0 cm, charge? raight line. Their charges are Q1-+2x10°C, Q21x10°C and Q3=-3x10° C. The distance between 1 and Q2is 2x 10-2 m and the distance between Q2 and Q3 is 4 × 10-2 m. What is the net electrostatic force on Q2 due to the other two charges? (Answer: 6.19% 10-5 N to the right.) -2q -3 × 10-9 c +2 x 10-9 C +1 x 10-9 C 0 +q +9 2 × 10-2 m 4 × 10-2 m 14 (Q3) (02)Explanation / Answer
1) By using Coulombs law,
F = kq1q2/r^2
90 = 9e9 *q^2 /0.01^2
q = sqrt (90*0.01^2 /9e9)
= 1*10^-6 C answer
Hence the magnitude is 1*10^-6 C, sign can be either positive or negative.
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