The resistivity of the material of a wire is 1.76 × 10-8 ?m. If the diameter of the wire is 2 × 10-3 m and its length is 2 m, what is its resistance?
A)
112 ?
B)
11.2 ?
C)
1.12 ?
D)
0.112 ?
E)
0.0112 ?
E
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Indicate whether the statement is true or false
Two equal charges, each Q, are separated by some distance. What third charge would need to be placed half way between the two charges so that the net force on each charge would be zero?
a. ?Q b. ?Q/2 c. ?Q/4 d. ?Q/8