An object is hung using a metal spring. If now a current is passed through the spring, what will happen to this system?
A) The spring will begin to swing like a pendulum.
B) The spring will extend, lowering the weight.
C) The spring will contract, raising the weight.
D) The weight will not move.
E) None of these are true.
Question 2
You are given a copper bar of dimensions 3 cm 5 cm 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the largest possible resistance, you should attach the leads to the opposite faces that measure
A) 3 cm 5 cm.
B) 3 cm 8 cm.
C) 5 cm 8 cm.
D) Any pair of faces produces the same resistance.
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