Three spiders are resting on the vertices of a triangular web. The sides of the triangular web have a length of a-0.54 m, as depicted in the figure. Two of the spiders (S, and S,) have +8.3 uC charge, while the ot has -8.3 uC charge. a/2 al2 (a) What are the magnitude and direction of the net force on the third spider (S,)? magnitude direction counterclockwise from the +x-axis (b) Suppose the third spider (S3) moves to the origin. Would the net force on the third spider (S,) be greater than, less than, or equal to the magnitude found in part (a)7 O greater than in part (a) O less than in part (a) O equal to the part (a) (c) What are the magnitude and direction of the net force on the third spider (S,) when it is resting at the origin? IN ° Counterclockwise from the +x-axis magnitude direction

Two equally charged, 1.00 g spheres are placed with 4.00 cm between their centers. 2 When released, each begins to accelerate at 225 m/s . As the spheres move, do you expect the force between them to increase, decrease or remain the same? Use an equation to justify your reasoning. Calculate the spacing needed between the spheres that would cut the force between them in half.

The diagram below shows two metal spheres taken from Newton's cradle and separated by a distance of 0.1 meters. Thẻ charge on sphere A is +6.0 x 10 3 coulomb and the charge on sphere B is +3.0 x 10 3 coulomb. -0.1 m- A B Which statement best describes the electrical force on the spheres? O It has a magnitude of 162,000 N and is repulsive. O It has a magnitude of 162,000 N and is attractive. O It has a magnitude of 16,200 N and is attractive. O It has a magnitude of 16,200 and is repulsive.

60.0 magnitude direction 0.500 mm (a) Red blood cells often become charged and can be treated as point charges. Healthy red blood cells are negatively charged, but unhealthy cells (due to the presence of a bacteria, for example) can become positively charged. In the figure, three red blood cells are oriented such that they are located on the corners of an equilateral triangle. The red blood cell charges are A = 2.30 pC, B = 7.30 pC, and C= -3.90 pC. Given these charges, what would the magnitude and direction of the electric field be at cell A? (1 pC = 1 x 10-¹2 C.) N/C counterclockwise from the +x-axis.