1. When the magnetic field is parallel to a surface, then the magnetic flux through the surface is:

2. The energy stored in a 50 mH inductor carrying a current of 4 A is:

3. The flux linked with a coif at any instant t is given by ∅ = 10t² - 50t + 250. The induced emf at t = 35 is:

4. Two coils of self inductance 2 mil and 8 mil are placed so close together that the effective flux in one coil is completely linked with other. The mutual inductance between these coils is :

5. The core of a transformer is laminated because: