Which one of the followings is an equation ?

Which one of the following is an equation?

Which one of the following is an equation of magnetic energy density ?

Which one of the following is an equation of magnetic energy density?

Which one of the following is the equation for Position - Time relation? A) S= "ut" +1//2 "at"^2 B) V = u + at C) U = y + at D) 2as = v^2 – u^2

Which one of the following is equation of the modulus of rigidity? (Where the symbols have their usual meanings)

x=sinthetacosthetaand y =sintheta+costheta are satisfied by which one of the following equations ?

If x = (1 + sqrt(3))/(2) and y = x^3 then y satisfies which one of the following equations ?

Which one of the following is not the equation of an SHM?