____________N 2. What are the magnitude and direction of the electric field midw

Question

____________N

2. What are the magnitude and direction of the electric field midway between two point charges, ?13 C and +15 C, that are 7.0 cm apart?

____________N

3. 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) The object has a charge of +16.0 C and the instrument indicates that the electric force exerted on it is 50.0N, due east. What are the magnitude and direction of the electric field?

E=_________

  (b) What are the magnitude and direction of the electric field if the object has a charge of -15.0 C and the instrument indicates that the force is 26.0 N, due west?

E=_________

Explanation / Answer

1. mag = q E = 5.6E-7*1.8E6=1.008 N
direction will be to the east

2. both will point same direction and E will point towards the negative charge

E = 9.0E9*13.0E-6/0.035^2+9.0E9*15.0E-6/0.035^2
=2.06E8 N/C

3. will point towards east

E = F/q = 50.0E-6/16.0E-6 = 3.125 N/C

b) directill be oposite so east

E = F/q = 26/15 = 1.733 N/C

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