Explanation:
36. B. digital signal
Electronic signals that pulse current in a series of ones and zeros are known as Digital Signals. A digital signal refers to an electrical signal that is converted into a pattern of bits.
37. C. near both poles
The Magnet field would be strongest on both sides, the North and the south pole. It is equally strong at the north pole when compared with the south pole.
38. C. Voltage
A transformer is designed to convert alternating current from one voltage to another. It can be designed to "step up" or "step down" voltages
39. A. Earth travels around the sun
Earth travels around the sun, the gravity of the Sun keeps Earth and the other planets in their orbits. Just as the Moon orbits the Earth because of the pull of Earth's gravity, the Earth orbits the Sun because of the pull of the Sun's gravity.
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