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Using method of dimensions, establish relation among given physical quantities : (a) Heat H produced in a wire depends on current i flowing through it, its resistance R and time t . (b) The magentic field F_(m) acting on a moving charged particle in magnetic field depends on charge on particle q , its speed v and magnetic field B Dimensional formulae : R : ML^(2) T^(-3) A^(-2), B : MT^(-2) A^(-1)