Q. 30 - Excercises And ProblemsExpert-verified
What are the strength and direction of an electric field that will balance the weight of a 1.0 g plastic sphere that has been charged to -3.0 nC?
The electric field that will balance the weight is
mass of the sphere
charge of the sphere
In order to balance the weight of the sphere, the electric force must be equal in magnitude to the weight of the sphere:
Solving the equation for E, we find the strength of the electric field:
You have two small, balls that have been given equal but opposite charges, but you don't know the magnitude of the charge. To find out, you place the balls distance apart on a slippery horizontal surface, release them, and use a motion detector to measure the initial acceleration of one of the balls toward the other. After repeating this for several different separation distances, your data are as follows:
Use an appropriate graph of the data to determine the magnitude of the charge.
You have a lightweight spring whose unstretched length is 4.0 cm. First, you attach one end of the spring to the ceiling and hang a 1.0 g mass from it. This stretches the spring to a length of 5.0 cm. You then attach two small plastic beads to the opposite ends of the spring, lay the spring on a frictionless table, and give each plastic bead the same charge. This stretches the spring to a length of 4.5 cm. What is the magnitude of the charge (in nC) on each bead?
A plastic rod that has been charged to -15 nC touches a metal sphere. Afterward, the rod’s charge is -10 nC.
a. What kind of charged particle was transferred between the rod and the sphere, and in which direction? That is, did it move from the rod to the sphere or from the sphere to the rod?
b. How many charged particles were transferred?
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