1. Two charges are located on the positive x-axis of a coordinate system. Charge ๐1 = 2 ร 10โ9๐ถ is 2cm from the origin, and charge ๐2 = โ3 ร 10โ9๐ถ is 4cm from the origin. What is the total force exerted by these two charges on a charge ๐3 = 5 ร 10โ9๐ถ located at the origin?
2. A negative charge of โ0.50 ร 10โ6๐ถ exerts a repulsive force of magnitude 0.20 N on an unknown charge 0.20 m away. What is the unknown charge (magnitude and sign)?
3. How many excess electrons must be placed on each of two small spheres spaced 3cm apart if the spheres are to have equal charge and if the force of repulsion between them is to be 10โ19๐?
4. What is the electric field 30cm from a charge ๐ = 4 ร 10โ9๐ถ?
5. The electric field caused by a certain point charge has a magnitude of 5.0 ร 103 ๐ ๐ถ at a distance 0.10m from the charge. What is the magnitude of the charge?
(2)
(3)
We know that
(4)
Electric field
(5)Electric field
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