3. A particle with a charge of -5.0x104 C and a mass of 2.0x10^9kg moves with a velocity of 1.0x10^3 m/s in the +x direction. It enters a uniform magnetic field of 0.20 T, whose address is +y (see figure). a. What is the magnitude of the force on the particle as soon as it enters the field? b. What is the radius of the circular arc that the particle will travel while in the field?

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