Exam 2 (2 point each) LE CHOICE. Choose the one alternative that best completes

Question

Exam 2 (2 point each) LE CHOICE. Choose the one alternative that best completes the statement or ar 1) An equipotential surface must be A) oriented 30 with respect to the electric field at every point B) parallel to the electric field at every point C) perpendicular to the electric field at every point. D) equal to the electric field at every point. B) oriented, 60° with respect to the electric field at every point at every pointupo tenidmoo airlt to 2) Capacitance of capacitors depends upon SIDE ( (a A) the space between the conductors. B) the geometry of the conductors. C) the material between the conductors. D) all of these answers. E) none of these answers. 3) A negative charge, if free, tries to move A) toward infinity B) from high potential to low potential. C) in the direction of the electric field. D) from low potential to high potential. E) away from infinity. 4) When electric current is flowing in a metal, the electrons are moving A) at none of the above speeds. B) at nearly the speed of light. C) at the speed of sound in the metal. D) at the speed of sound in air. E) at the speed of light.

Explanation / Answer

1)

for the equipotential surface ,the potential is same on all the points

hence ,there is no change in electric potential the electric field must be perpendicular to equipotential surface.

option(C)

2)

the capacitance is given as C = Area * Epsilon/area

also , the capacitance depends on the type of capacitance

the correct option is

D) all of the answers

3)

direction of electric field is from high potential to lower potential

as the negative charge move in oposite direction of electric field

the correct option is D) from low potential to high

4)

the speed of electrons keeps varying in the metals

and usually is assumed equal to drift speed

hence , the correct option is A) at none of the above speeds

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