I already asked these , and the answers provided were wrong. A piece of copper w
ID: 1535785 • Letter: I
Question
I already asked these , and the answers provided were wrong.
A piece of copper wire has a resistance per unit length of 5.60 times 10^-3 Ohm/m. the wire is wound into a thin, flat coil of many turns that has a radius of 0.200 m. the ends of the wire are connected to a 10.0-V battery. Find the magnetic field strength at the center of the coil. the maximum torque experienced by a coil in a 9.00 times 10^-3 T magnetic field is 0.65 N.m. the coil is circular and consists of nine turns. the current in the coil is 7.80 A. What is the length of the wire from which the coil is made?Explanation / Answer
Total Resistance=5.6*10^-3*(2r)n= 7.037 x 10^-3 n ohm
I=V/R = 10/7.037e-3n
We knows that B= u0 * I *n / (2r)
B= (4*pi*10^-7*10*n) / (2*0.2* 7.037*10^-3*n) B = 4.46 x10^-3 T
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