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Equivalent resistance concepts
False:
R
cd
is always less than or equal to R
3
.
True:
R
ab
is always less than or equal to R
1
.
True:
After connecting
c
and
d
to a battery,
the current through R
3
always equals the current through R
4
.
True:
After connecting
a
and
b
to a battery,
the voltage across R
1
always equals the voltage across R
2
.
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In the picture below, the two wires carry current i
1
and i
2
,
respectively, with positive current to the right.
The charge q is positive and has velocity v to the right.
False:
If i
2
= 0 and i
1
is greater than zero,
then the force on q points into the page.
True:
If i
1
= 0 and i
2
is greater than zero then the force on q is south.
True:
If v = 0, then the force on q is zero.
False:
If i
2
= 0 and i
1
is greater than zero, then
the magnetic field near charge q points out of the page.
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 Spring '06
 MR.Nagy
 Resistance, Heat, Magnetic Field, Electrical resistance, field free region

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