To find the magnitude of the magnetic field, we can use the formula for the magnetic force on a charged particle moving in a magnetic field:
F = q * v * B
Where F is the magnetic force, q is the charge of the particle, v is the velocity of the particle, and B is the magnetic field.
We can rearrange the formula to solve for B:
B = F / (q * v)
Given:
q = 12 μC = 12 x 10-6 C
v = 9.0 x 106 m/s
F = 8.7 x 10-3 N
Plugging in these values, we can calculate the magnitude of the magnetic field:
B = (8.7 x 10-3 N) / (12 x 10-6 C * 9.0 x 106 m/s)
B ≈ 6.08 T (Tesla)
Therefore, the magnitude of the magnetic field is approximately 6.08 Tesla.