A straight wire carries a current, I, in the plane of the page as shown. A loop

Question

A straight wire carries a current, I, in the plane of the page as shown. A loop is located to the left of the straight wire and also in the plane of the page as shown. The loop carries a current of 10 A in the clockwise direction. The distance between the wire and the center of the loop is equal to the radius of the loop, 30 cm. The resulting magnetic field is zero at the center of the loop. What is the direction of the current in the wire, I? toward the bottom of the page toward the top of the page to the right to the left cannot be determined from the information given In the previous question, how big is the current in the wire. I? 10 A 3.18 A 3.14 A 20 A 31.4 A

Explanation / Answer

21)from the diagramthe direction of the current in a loop is clock wise direction and null point is formed between

coil and stright wire along the axis at center point , hence the direction of the current in straight wire is toward the bottom of the page

22) when currents are in same direction i1/x=i2/r-x

here i1=i,i2=10A,x=r-x=30

then i1=i2=10A

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