Question

An electric company charges 10 cents per kWh. How much does it cost to use a 125 W lamp 3 hours a day for 30 days?

$0.11

$113.00

$11.30

$1.13

Conduction electrons move to the right in a certain wire. This means the electric field points to

down

up

left

right

How many electrons are needed to create a force of 7 kN when they are place 0.1 mm away from 10 nC charge?

The charge of an electron is 1.6 x 10^-19C.

		4.9 x 1012 electrons
		7.0 x 1019 electrons
		3.5 x 1015 electrons
		5.0 x 109 electrons

When a piece of paper is held with one face perpendicular to a uniform electric field the flux through it is 25 N m²/C. When the paper is turned 10^o with respect to the field the flux through it is

		equal to  25 Nm2/C.
		less than 25 Nm2/C.
		unknown
		more than 25 Nm2/C.

The electric field at a distance of 1000 cm from an isolated point particle with a charge of 2 µC is

		18 N/C
		1800 N/C
		1.8 N/C
		180 N/C

Answer 1