Calculate the magnetic flux produced by a coil with 80-turns winding, 15cm external radius toroidal core and 10cm radius constructed with silicon steel, traversed by a current of 5A, knowing that the density of the magnetic field in this core is equivalent to 10600 Gauss. Also calculate the magnetic reluctance of the core, being the relative magnetic permeability of silicon steel of 10200.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

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blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.