Current from a battery and any battery powered device is always

Objects can be charged by

Lightning bolts occur between

Compared to the resistance of two resistors connected in series, the same two resistors connected in parallel have

Which of Earth’s geographic poles is nearest its magnetic north pole?

Compared to its speed in air, the speed of light in water is

Solar eclipses are seen less commonly than lunar eclipses because

An ideal vertical polarizing filter will transmit 50% of nonpolarized parallel light incident on it. How much light is transmitted by two ideal vertical polarizing filters that are oriented with their axes parallel to each other?

If sunlight were green instead of white, the most comfortable color to wear on a hot day would be

The law of reflection says that

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