The location marked P in the drawing lies midway between the point charges +q and -q. The blue lines labeled A, B, and C are edge-on views of three planes. Which of the planes is an equipotential surface? +9 P B A and C ○ A, B, and C ○ Only B ◇ None of the planes is an equipotential surface

Four point charges, which are initially infinitely far apart, are placed on the four corners of a square with side d. If zero net work was done by an external force in placing the charges at the four corners of the square, what is the value of the charge at the lower-right corner? +q -9 +q O A. I O B. Q = 9 Q = 9 C. Q = q 3 [2√2-1 [2√2+1 [2√2+1 [2√2-1 9 Q

•14 In the temperature range 310 K to 330 K, the pressure p of a certain nonideal gas is related to volume V and temperature T by p = (24.9 J/K) т? (0.00662 J/K?) How much work is done by the gas if its temperature is raised from 315 K to 325 K while the pressure is held constant?

Two equal charges are situated on the x axis at 40.0 cm on either side of the origin as shown in the figure below. Location A is on the perpendicular bisector at a distance of 21.0 cm from the origin on the y axis. (Assume that the +x axis is directed to the right and they axis is directed up.) 91 *A 92 (a) If q,- -3.50 C and q,- -3.50 C what is the net electric field due to both charges at location A? Express your answer in vector form. 1.64-10%) x Did you consider the symmetry of the situation? What is the net contribution to the field from the x components of the field from each charge? N/C (b) If a, 3a, (where q,- -3.50 pC), what is the net electric field at location A due to both charges? Express your answer in vector form -4.68-10%-4.1-10% x If the two charges are unequal, what is the net contribution to the field from each charge in the two perpendicular directions? N/C