Aportion of nichrome wire of radius3.70mm is to be used in winding a heating coil. if the coil must draw a current of9.85a when a voltage of 120 v is applied across its ends, find the following. (take the resistivity of nichrome to be1.50a portion of nichrome wire of radius3.70mm is to b10-6? ? ) the required resistance of the coil(b) the length of wire you must use to wind the coil.

To develop this problem it is necessary to have the concepts related to Ohm's law and resistivity.

Ohm's law is defined by the equation

Where

R=Resistence

I = current

V= Voltage

While the resistivity equation is given by

Where

resistivity

A= cross-section area

R= Resistance

L=Lenght of wire

A) We can find the resistence re-arranging our first equation, so

B) From our second equation we can re-arrange for L, so

a.

explanation:

i think they are all correct

explanation:

they seem good