I need help with question 4 The secondary current is 50 A. The secondary coil of

Question

I need help with question 4 The secondary current is 50 A. The secondary coil of the transformer has 18 turns. Find power developed in the primary and secondary coils and the number of turns in the primary coil. A square metal frame of resistance 10 ohm is pushed with a force of 20 N into a homogenous magnetic field of 2 T with a constant speed of 20 m/s. What is size of this frame if the current generated in it is 5 mA? An optical system is made of converging and diverging lenses with focal distances 12.5 mm and 54 mm respectively. How large is the final

Explanation / Answer

induced emf =e = B LV

where B= magnetic field

L=length of side of square frame

V= velocity

so induced current= induced voltage/resistance

i= e/R

5x10-3 =( 2 * L * 20)/10

L= 1.25x10-3 m

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