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Physics 8B Spring 2002 (Section 2)
MIDTERM 1
Useful data:
&) = 8.85 x 10°? CUN-m’ o- be
k= 8.99 x 10° N-m/C? Ad
e=i6x10PC :
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Each problem is worth 10 points. L
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1. In the diagram, what is the potential at point _ —_
P? Assume g = 1.0 pC and d = 0.30 m. +eoaO*@P a tee
2. Along, thin nonconducting rod has a charge per unit length of -5.0 x 10° Cém
uniformly distributed along its length. The rod is located along the axis of a
conducting cylindrical shell with inner radius 10.0 cm, outer radius 20.0 cm, and a net
charge per unit length of +8.0 x 10” C/m, What is the magnitude and direction of
the electric field at a distance from the rod of (a) 5.0 cm, (b) 15.0 cm, (c) 25.0 cm?
What is the charge per unit area (not per unit length!) on the (d) inside surface and (e)
i 2
outside surface of the shell? CronpeSectronel weew
In the diagram, what is the charge on and
potential difference across the 4.0 [LF capacitor?
100V
In the circuit, find the current
going through each battery, and
the power of each hattery, stating + — ¢oy 4 Of
whether energy is supplied or
absorbed by it.
qav t=20v
A current of 3.0 A is passing through a metallic strip of width 5.0emand , :
thickness 0.20 mm (thickness refers to the dimension going in and out of Jb
the page). There are 8.5 x 10 conduction electrons/m’ in the strip. A
magnetic field of 0.40 T is applied perpendicular to the strip (out of the
page). (a) What is the current density? (b} What is the electron drift . soe
velocity? (¢) What are the magnitude and direction of the electric field
resulting from the Hall effect?
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