10) A 20 turn coil of area 10 cm is placed in a magnetic field so that the norma

Question

10) A 20 turn coil of area 10 cm is placed in a magnetic field so that the normal to its area is in the direction of the field. If the field originally has a value of 0.25 T that increases to 0.35 T in 2.0 seconds, what is the average emf induced in the coil?

On this next problem, I understand that since it's an ideal transformer, its input is equal to its output... Mathematically, can you explain this for me please.

14) An ideal transformer has 200 turns on its primary and 12 turns on its secondary. If the power input to the transformer is 120 kW, what is the power output?

Explanation / Answer

a) E = N?I/?t = NA?B/?t = (20)(10E-4)(.35-.25) / 2 = .001 V b) P = inpute = 120 kW P' = output = ? Ideal transformer, so: P = P' = 120 kW

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