The two most common units of electric energy is Watts or hertz.
Answer:
No concave lens cannot be used to make hand lens because in hand Lens we use convex lens so as to converge the rays of the light After refraction and helps to produce a magnified image of an object.
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Answer:
the circuit must be closed
Explanation:
it will move the object if you apply force, because of that it will stay the same with newton's law.
