The figure below shows a long straight wire just touching a loop carrying a curr

Question

The figure below shows a long straight wire just touching a loop carrying a current I1. Both lie in the same plane.

Q:What direction must the current I2 in the straight wire have to create a field at the center of the loop in the direction opposite to that created by the loop?

Use the compass rose to specify the direction. 2 options

NE to SW or SW to NE

Q:What is the ratio of I1/I2 that gives zero field strength at the center of the loop?

Q:What is the direction of the field directly above the loop under this circumstance?
Field above loop

The figure below shows a long straight wire just touching a loop carrying a current I1. Both lie in the same plane. Q:What direction must the current I2 in the straight wire have to create a field at the center of the loop in the direction opposite to that created by the loop? Use the compass rose to specify the direction. 2 options NE to SW or SW to NE Q:What is the ratio of I1/I2 that gives zero field strength at the center of the loop? Q:What is the direction of the field directly above the loop under this circumstance? Field above loop ??? 7 options N, E, S, W, out of page, into page, no field

Explanation / Answer

apply Hall Voltage V = Ed

where E is Electric field = BVd

and Vd is Drift spped =   i/neA

so Hall Voltgae Vh = B* (i/neA) * d

n = iBd/(Vh e L)

n = 3 * (6.5) * 1e-3/(1.2 e-6 * 1.6 e-19 )

n = 1.015 e23 no. of electrons /m^3

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