In this problem, you have two charges q1=3.55µC and q2=-4.88µC (µC stands for "micro-Coulomb). You are asked to determine the value of the electric force at point P. q2 is located a distance of 6.37m to the left of P, and q1 is located a further 1.7m to the left of q2- If the net electric field at point P points to the left, then your value should be negative. If the value of the net electric field at point P is oriented to the right, then you value should be positive. - r2 to 1 r2 P +x 91 92 Note: It is understood that the unit of your answer is in Newtons/Coulomb (N/C), however do not explicitly include units in your answer. Enter only a number. If you do enter a unit, your answer will be counted wrong.

Three charges are at the corners of an equilateral triangle, as shown in the figure below. Calculate the electric field at a point midway between the two charges on the x-axis. (Let q1 = 2.50 ?C,q2 = 6.00 ?C,and q3 = −2.50 ?C.)

The cockroach Periplaneta americana can detect a static electric field of magnitude 9.00 kN/C using their long antennae. If the excess static charge on a cockroach is modeled as point charges located at the end of each antenna, what magnitude of charge q would each antenna possess in order for each antennae to experience a force of magnitude 4.50 µN from the external electric field? Calculate q in units of nanocoulombs (nC). q = nC