Answer :
The direction of the magnetic field is east and its magnitude is 0.171T.
Here we have to find the direction and magnitude of the minimum magnetic field needed.
The given values:
mass/ length (m/l) = 0.505 g/cm
Current(I) = 2.94A
Let the magnetic field be B
Formula:
Form F = I( l× B)
As it is in the south direction. So gravity is in a downward direction.
F = I( lB)
F/l = IB
F/l = mg/l
=( 0.505× [tex]10^{-3}[/tex]/ [tex]10^{-2}[/tex]) 10
=0.505
Now put in the equation we have:
0.505 = 2.94 × B
B = 0.171T in the east direction.
Therefore the direction is in the east and the magnitude of the magnetic field is 0.171T.
To know more about the magnetic field refer to the link given below:
https://brainly.com/question/1691855
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