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**1. Homework Statement**

A singly charged positive ion with a mass of 6.68 x 10^-27 kg moves clockwise with a speed of 1.10 x 10^4 m/s in a circular path with a radius of 2.00 cm. Find the direction and strength of the magnetic field. (Hint: The magnetic force exerted on the ion is the force that maintains circular motion, and the speed of the ion given is its tangential speed.)

_____ T

**2. Homework Equations**

F = ma and since the particle travels in a circle, F = mv² / r which is the magnitude of the magnetic field.

**3. The Attempt at a Solution**

F = 6.68•10^-27 kg•(1.10•10^4 m/s)² / 0.2m

but the answer is wrong.

why?