Determining electric fields Suppose you want to determine the electric field in

Question

Determining electric fields Suppose you want to determine the electric field in a certain region of space. You have a small object of known charge and an instrument that measures the magnitude and direction of the force exerted on the object by the electric field. -------------------------------------------------------------------------------- (a) How would you determine the magnitude and direction of the electric field if the object were positively charged? The magnitude of the electric field is equal to the magnitude of the electric force. The direction of the electric field is the same as the direction of the electric force. The magnitude of the electric field is equal to the magnitude of the electric force divided by the magnitude of the charge. The direction of the electric field is the same as the direction of the electric force. The magnitude of the electric field is equal to the magnitude of the electric force divided by the magnitude of the charge. The direction of the electric field is opposite to the direction of the electric force. The magnitude of the electric field is equal to the magnitude of the electric force. The direction of the electric field is opposite to the direction of the electric force. (b) How would you determine the magnitude and direction of the electric field if the object were negatively charged? The magnitude of the electric field is equal to the magnitude of the electric force. The direction of the electric field is the same as the direction of the electric force. The magnitude of the electric field is equal to the magnitude of the electric force. The direction of the electric field is opposite to the direction of the electric force. The magnitude of the electric field is equal to the magnitude of the electric force divided by the magnitude of the negative charge. The direction of the electric field is opposite to the direction of the electric force. The magnitude of the electric field is equal to the magnitude of the electric force divided by the magnitude of the negative charge. The direction of the electric field is the same as the direction of the electric force.

Explanation / Answer

electric field E = F/q

F = force, q = charge
(a) E = 40.0 N/20.0 C = 2.00 N/C direction is east

(b) E = -20.0 N/-10.0 C = 2.00 N/C direction is east

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