Que. The word ‘Physics’ is written on a sheet of white paper with a red pencil. A green and red pieces of glass are available. Through which glass can the word be seen?
Ans. With green glass the word will appear black against the green background of the paper since the red colour of the word does not pass through green glass. Thus green glass should be used.
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A soap bubble is given a negative charge, then it's radius
d)Unchanged or nothing can be predicted.?
Negatively charge will be uniformly distributed over the surface leading to repulsion between the charges and increasing the size of bubble.