In the figure,if a = 2.0 cm,b = 4.0 cm,and I = 2.0 A,what is the magnitude of the magnetic field at point P?
A)49 μT
B)39 μT
C)50 μT
D)69 μT
E)13 μT

Question

In the figure,if a = 2.0 cm,b = 4.0 cm,and I = 2.0 A,what is the magnitude of the magnetic field at point P? 
A)49 μT 
B)39 μT 
C)50 μT 
D)69 μT 
E)13 μT

Quizplus · Accepted Answer

The magnetic field at point P can be found using the formula B = μ0I/2πr, where μ0 is the magnetic constant, I is the current, and r is the distance from the current-carrying wire to the point P. Substituting the given values, we get B = (4π×10^-7 T·m/A) × 2.0 A / (2π×0.02 m) ≈ 39 μT. Therefore, the best choice is B.

In the Figure,if a = 2