The electric field strengthfrom the surface of adiameter metal ball is. What is the charge on the ball?
Charge on the ball is.
Metal sphere has radius of.
Electric field at from surface is .
Electric field due to sphere of radiusand chargeat distance is
Calculate chargeat metal sphere.
The irregularly shaped area of charge in FIGURE has surface charge density. Each dimension (x and y) of the area is reduced by a factor of .
a. What is the ratio , where is the final surface charge density?
b. An electron is very far from the area. What is the ratio of the electric force on the electron after the area is reduced to the force before the area was reduced?
Your physics assignment is to figure out a way to use electricity to launch a small -long plastic drink stirrer. You decide that you’ll charge the little plastic rod by rubbing it with fur, then hold it near a long, charged wire, as shown in FIGURE P23.56. When you let go, the electric force of the wire on the plastic rod will shoot it away. Suppose you can uniformly charge the plastic stirrer to and that the linear charge density of the long wire is . What is the net electric force on the plastic stirrer if the end closest to the wire is away?
Hint: The stirrer cannot be modeled as a point charge; an integration is required.
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