An infinite plane slab, of thickness 2d, carries a uniform volume charge density Pv placed parallel to x-y plane such that the x-y plane passes through the middle of the slab. Find the electric field inside the slab. Figure 5: Figure for Q5.

Faraday’s Law

A d.c. A shunt generator delivers a load current of 80 A at 400 V. Its armature and field resistances are 0.20 and 100 respectively. Stray losses are 1500 watts. So find (1) mechanical (2) electrical and (3) commercial efficiency.

A wind turbine of the 3-bladed propeller type, having 50% efficiency, generates 2 MWe when the wind speed is 14 m/s. The air density is 1.2 kg/m3. Under these conditions, the linear speed of the blade tips is 98 m/s. a) What is the propeller rotation rate in rpm? What is the propeller shaft torque? b) What is the torque if the turbine above has two instead of three blades?