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Q. An infinite number of charges, each equal to q are placed along the a-axis at x=1, 2 , 4 , 64 ---- and so on 1) if all the charges are of same sign , what is 'E' at origin? If Its charge is +ve , Find out charge is negative, third charge is positive --- so on .What is the E at origin ?

Q. A thin rod consists of two parts joined together. One-fourth of it is silver and three-fourths is gold. The temperature decreases by 21 C°.
ΔL/ (L0, Silver + L0, Gold)
Resolve the fractional decrease in the rod's length using the formula above, where L0,Silver and L0,Gold are the initial lengths of the silver and gold rods.

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