Four charges are placed at the four corners of a square of side 15 cm. the charges on the upper left and right corners are +3 μc and -6 μc respectively. the charges on the lower left and right corners are -2.4 μc and -9 μc respectively. the net electric force on -9 μc charge is: a. 18 n, 750 below the positive x-axisb. 18 n, 750 below the negative x- axisc. 18 n, 750 above the negative x- axisd. 18 n, 750 above the positive x- axis

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.

Which of the following is the phase that results when the moon is on the opposite side of the earth from the sun? a. quarter moon b. crescent moon c. new moon d. full moon

Should we celebrate the voyages of zheng he mini q answer key