Instructions: On occasion, the notation 
will be a shorthand notation for 
.
If 
= [2.5 cm, 80°], i.e., the magnitude and direction of are 2.5 cm and 80°, 
= [3.5 cm, 120°], and 
, what is the direction of 
(to the nearest degree)?
A. 247°
B. 235°
C. 243°
D. 216°
E. 144°
Answer: D
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A conducting sphere of radius 20 cm has a charge Q placed on it producing a field of magnitude
If the potential at the surface was
when the field was 
what is the potential when the field is 2
?
A.
B. 2
C. 4
D. 5
E. 16
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