3. When a negative charge is moved in the direction of the electric field, a. th

Question

3. When a negative charge is moved in the direction of the electric field, a. the charge increases. b. the field does work on the charge. c. the charge does work on the field. d. the charge gains potential energy. e. the charge loses kinetic energy. 4. Under static conditions, the field at a point inside a cylindrical conductor is a. proportional to the length of the conductor. c. proportional to the radius of the conductor c. proportional to the density of the conductor. d. proportional to the atomic number of the conductor e. zero.

Explanation / Answer

(3) force=qE

for nagative charge, F=-qE

so the eletric force on negative charge is in opposite direction to that of field.so if the negative charge is moved in the direction of eletric field, it will face repulsion and hence some work is done on the charge when is moved in the direction of field. that work done gets store in the charge in the form of potential energy. so the charge gains potential energy.

(4) electric field at any point inside a conducting cylinder is zero.this is because a conducting surface doesnot enclose any charge insie it. All the cahrge lies on its surface.

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