28. The dimensional formula of electric potential gradient is (1) [MLT3 A1] (2) [ML2T2 A1] (3) [MLT2 A1] (4) [MLT3 A1]

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L

L = r p sin θ

r

P

A force F is given by F=at + $b t^{2}$ , where t is time. What are the dimensions of a and b

b t^{2}

1 + (x y) + (x y)^{2} + (x y)^{3} + . . . .

a = 1 + 2 x + 3 x^{2} + 4 x^{3} + . . . . (- 1 < a < 1)

b = 1 + 3 y + 6 y^{2} + 10 y^{3} + . . . (- 1 < b < 1)

X

= \sqrt{(\frac{X}{density})}

X

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