1.the electricity received at an electric substation has a potential cifference

Question

1.the electricity received at an electric substation has a potential cifference of 2.80 10^5V.if the required output is 440 V. what should be the ratio of the turns of the step-down transformer? plz show work and thank n advanced.

2.why is an antenna desined to be one-half of the wavelength of the wave it is supposed to receive?

3.a current-carrying wire is orented at right angles to a uniform magnetic field. if the lenght of the wire is 0.50m and it experiences a force of 0.90 n while carrying a current of 4.0a. what is the strenght of the magnetic tield?

Explanation / Answer

1)280000/440=7000:11 for a step dn transformer, the primary side has more turns than the secondary:11/7000*280000=440 V secondary side of xfmr 2) the antenna is tuned to half wavelength, because of economics, it does does have to be as long

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