Physics and Astronomy Labs/Upcoming Test (a)

For the next Astronomy test on March 18, 2015

Questions not on this list will be on the next astronomy test

March 18 lab portion

1 If an electron's charge equals 2 in some units, and if r is the number of electrons per second, then the the current, I, equals

	I=2r
	I=(1/2)r
	I=4r
	I=r

2 If an electron's charge equals 1/2 in some units, and if r is the number of electrons per second, then the the current, I, equals

	I=(1/2)r
	I=2r
	I=4r
	I=r

3 In the gravitational analogy to electrostatics and electricity, what is the analog to charge? (Here, m is mass, h is height, and g is gravitational acceleration. Also, the formula for gravitational potential energy is mgh)

	m
	mg
	mgh
	gh

4 If the breakdown field for air is typically 60kv/inch (i.e. 60,000 volts per inch). What does that say about the voltage associated with a two inch spark?

	120 kV
	60 kV
	30 kV
	240 kV

5 If the breakdown field for air is typically 60kv/inch (i.e. 60,000 volts per inch). What does that say about the electric field associated with a two inch spark?

	120 kV/inch
	60 kV/inch
	30 kV/inch
	240 kV/inch

partition for testmakers

questions under constructin that will NOT be on the next test

Not on Astronomy test group 1 1 The units for qV=energy energy Joule/Coloumb Joules Coloumb 2 If an electron's charge equals 2 in some units, and if r is the number of electrons per second, then the the current, I, equals I=2r I=(1/2)r I=4r I=r 3 If an electron's charge equals 1/2 in some units, and if r is the number of electrons per second, then the the current, I, equals I=(1/2)r I=2r I=4r I=r 4 In the gravitational analogy to electrostatics and electricity, what is the analog to charge? (Here, m is mass, h is height, and g is gravitational acceleration. Also, the formula for gravitational potential energy is mgh) m mg mgh gh Group 2 1 Voltage is expressed as? energy/q q/energy I/gh gh/q 2 Is current equal to the number of electrons per second flowing through a wire? only in units where the charge of the electron equals one yes no only in units where the charge of the electron equals the potential energy of a mouse 3 In the gravitational analogy to electrostatics and electricity, what is analogous to voltage? (Here, m is mass, h is height, and g is gravitational acceleration. m mg mgh gh 4 question? yes wrong wrong wrong 5 question? yes wrong wrong wrong