Answer:
0.087 T
Explanation:
Note: The weight of the mass suspended is equal the force produced by the current carrying conductor in the magnetic field and this is the force needed to balance the pull of gravity
Fm = mg = BIL................................... Equation 1
Make B the subject of the equation
B = mg/IL.................................. Equation 2
Where B = magnetic Field, m = mass, g = acceleration due to gravity, I = Current, L = Length of the wire.
Given: m = 0.04 kg, I = 15 A, L = 0.13 m,
Constant: g = 9.8 m/s²
Substitute into equation 2
B = (0.04×9.8)/(15×0.13)
B = 0.392/4.5
B = 0.087 T
