What is a solenoid?
a) a single loop of wire in the shape of a circle
b) a radio antenna
c) a long coil of wire in the shape of a helix
d) a scanning mechanism inside of a television
e) a magnet that is inserted into a coil of wire
Ans: c) a long coil of wire in the shape of a helix
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In order to overcome a surface tension of a fluid, a force of 1.35 × 10^?2 N is required to lift a wire ring of circumference 13.0 cm. What is the surface tension of the fluid?
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