The power supply for your answering machine is a small black cube that plugs directly into an electric outlet. the main component in this supply is a transformer and a moderate current from the 120-volt power line flows through the primary coil of this transformer. if the transformer’s primary coil has 20 times as many turns of wire in it as the secondary coil has, then the secondary coil provides: (a) a large voltage rise for the large amount of current that flows through it. (b) a small voltage rise for the large amount of current that flows through it. (c) a small voltage rise for the small amount of current that flows through it. (d) a large voltage rise for the small amount of current that flows through it.

If the transformer’s primary coil has 20 times as many turns of wire in it as the secondary coil has, then the secondary coil provides a small voltage rise for the large amount of current that flows through it.

Option B

Explanation:

A transformer has a two types of coils, the first one is primary coils and the second one is secondary coil. A secondary coils with hardly any turns in it provides the charges going through it just limited quantities of energy.

Without a long separation over which to do chip away at the charges streaming in the loop, the transformer delivers just a little ascent in the voltage of those charges. Be that as it may, the coil can give this little voltage to ascend to a huge current without requiring an excess of power supply from the input circuit.

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air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.