A student exerts a force of 35 newtons to move a cart loaded with lab equipment to the prep room 20 meters. If it takes the stud
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Answer:
Required charge .
Explanation:
Given:
Diameter of the isolated plastic sphere = 25.0 cm
Magnitude of the Electric field = 1500 N/C
now
Electric field (E) is given as:
where,
k = coulomb's constant = 9 × 10⁹ N
q = required charge
r = distance of the point from the charge where electric field is being measured
The value of r at the just outside of the sphere =
thus, according to the given data
or
or
Required charge .
Now,
the number of electrons (n) required will be
or
or