The dimension of magnetic field in M, L, T and C (Coulomb) is given as
MLT–1C–1
MT2C–2
MT–1C–1
MT–2C–1
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The period of oscillation of a simple pendulum is $T = 2\pi\sqrt{\dfrac{L}{g}}$. Measured value of L is 20.0 cm known to 1 mm accuracy and time for 100 oscillations of the pendulum is found to be 90 s using a wrist watch of 1 s resolution. The accuracy in the determination of g is