< Physics and Astronomy Labs

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

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