Point charges q1=q2=2.79⨯10-9C are fixed on the y-axis at y = 0.832m and y = -0.832m. There is a charge q3 has 25⨯10-9 C at x=0.245m, y= -83 .  The point P is at x=0.245m, y=0. (This is the same set up as the previous problem. However, the numbers and the component to calculate are different.) What is the horizontal (x) component of the total electric field at P, due to all three charges in Newtons/Coulomb?  Calculate to 1 decimal place. You must draw and label a diagram. Which charges produce a horizontal electric field component?

A point charge of 7.19x10^-6 C is at the origin while a second point charge of -6.87x10^-6 C is at the coordinates (0.58,0.32) meters. In degrees relative to he positive x direction, what's the direction of the force exerted on the charge at the origin?

Two tiny conducting spheres are identical and carry charges of -21.3 µC and +65.3 µC. They are separated by a distance of 3.57 cm. (a) What is the magnitude of the force that each sphere experiences? (b) The spheres are brought into contact and then separated to a distance of 3.57 cm. Determine the magnitude of the force that each sphere now experiences. (a) Number (b) Number i Units Units

Jwo metal spheres, each of radius 4.2 cm, have a center-to-center separation of 1.9 m. Sphere 1 has a charge of + 1.5 x 10 C; sphere 2 has a charge of - 3.4 x 10 C. Assume that the separation is large enough for us to assume that the charge on each sphere is uniformly distributed (the spheres do not affect each other). With V = 0 at infinity, calçulate in volts (a) the potential at the point halfway between their centers and the potential on the surface of (b) sphere 1 and (c) sphere 2. (a) Number i Units (b) Number i Units (c) Number i Units

A charge Q is transferred from an initially uncharged plastic ball to an identical ball 15cm away. The force of attraction is then 40.47 mN. How many electrons were transferred from one ball to the other? Answer in SI units and multiply your answer by 10^-12.

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The distance between two charges gl = +2uC and q3 - +6uC is 20cm. Calculate the distance from charge ql to the points on the line joining the two charges where q2 = +1µC does not move.

(a) Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 13.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) Imagine adding electrons to the pin until the negative charge has the very large value 1.00 mC. How many electrons are added for every 109 electrons already present?

Common static electricity involves charges ranging from nanocoulombs to microcoulombs. (a) How many electrons are needed to form a charge of −4.50 nC? (b) How many electrons must be removed from a neutral object to leave a net charge of 0.410 µC?

Given that the human body is mostly made of water, estimate the total amount of positive charge in a 63 kg person.