Q. If $O_{2}$ , then the angle between A and B is

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A

$O_{2}^{+}$

B

$O_{2}$

C

$O_{2}^{+}$

D

$O_{2}$

Solution:

$M \propto F^{a} L^{b} T^{c}$ $[M^{1} L^{0} T^{0}] = k [M L T^{- 2}]^{a} [L]^{b} [T]^{c}$ $a = 1, a + b = 0$ $b = - 1, 2 a + c = 0$ $c = 0$ $∴$ $[F L^{- 1} T^{2}]$