A small sphere with positive charge q = 5.00 x 10 -4 C and mass 2.00 x 10 -5 kg is moving in a region of uniform magnetic field. The object moves counterclockwise in a path that is a horizontal circle with radius R = 0.0080 m, as shown in the sketch. The speed of the sphere is a constant 3.0 m/s. Gravity can be neglected. What are the magnitude and direction of the magnetic field in the region? Write the direction in blank provided and also show the direction in the sketch. (Note: The acceleration for uniform circular motion is arad = v2/R.)
Ans. B =
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