Two coils of wire are placed close together. initially, a current of 4.44 a exists in one of the coils, but there is no current in the other. the current is then switched off in a time of 2.96 x 10^-2 s. during this time, the average emf induced in the other coil is 4.30 v. what is the mutual inductance of the two-coil system?

Amixture of slurry and mud is to be pumped through a horizontal pipe of diameter 500 mm. the fluid behaves as a bingham plastic with a yield stress of 30 pa and viscosity 0.04 pa.s. describe the effects of the shear stress through a transverse section of the pipe by plotting the variation in shear stress and velocity profile: (i) just before the slurry starts to move (ii) as the slurry flows when the pressure gradient is double that in part (i)