leapfroggiez
10.02.2020 •
Physics
A copper wire of length L and cross sectional area A is used in an electrical application. If the same wire is cut in half and the two pieces are connected in parallel in the same application, how does the wire resistance in the latter connection compare to the wire resistance in the initial connection?
A) The resistance is the same since it is the same wire
B) The resistance is doubled
C) The resistance is quadrupled
D) The resistance is halved
E) The resistance is quartered
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Ответ:
Explanation: Two pith ball will repel each other . they will remain balaced due to tension in the spring whose one component balances the weight and the other balances the repulsive force on each.
The gravitational force will be balanced by T cos 27.33 and the electrostatic repulsive force will be balanced by T sin27.33
So
Fg =T cos 27.33
= .55 X .888
= .49 N
Fq = T sin27.33
=.55 x .459
= .25 N.