A rectangular loop has 85 turns with an area of 0.225 m^2 and lies in a uniform

Question

A rectangular loop has 85 turns with an area of 0.225 m^2 and lies in a uniform magnetic field of 0.28 T. Several Physics lab students have reported that the maximum torque exerted on this loop is 1.2 x 10^-2 Nm.
i) What is the current in the coil?
ii) If instead, all 85 turns are unwound and form a rectangle with the same shape (but obviously much larger), would the value of the current be LARGER, SMALLER, or THE SAME?
iii) Calculate the value of the current in this case to confirm your answer above.

Explanation / Answer

1)T=I*B*A;I=T/(B*A)=0.19 AMP; 2)SMALLER 3)0.19/85 AMP=0.0022AMP

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