What are the strength and direction of the electric field at the position indicated by the dot in FIGURE EX23.4? Specify the direction as an angle above or below horizontal
The magnitude of the net electric field is . The direction of the electric field is .
Given a positive and a negative charge:
The direction of the electric field due to the positive point charge is always acting away from the point charge and the electric field due to the negative charge acts towards the negative charge.
The electric field is a vector quantity. They cannot be added directly but can be added vectorially.
Calculate the electric field as follows:
Charge Q is uniformly distributed along a thin, flexible rod of length L. The rod is then bent into the semicircle shown in FIGURE. 23.47
a. Find an expression for the electric field at the center of the semicircle.
Hint: A small piece of arc length spans a small angle , where is the radius.
b. Evaluate the field strength if and .
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