A particle with a mass of 2. 00×10−⁴ kg carries a negative charge of −3. 80×10−⁸ C. The particle is given an initial horizontal velocity that is due north and has a magnitude of 3. 61×10⁴ m/s What is the magnitude of the minimum magnetic field that will keep the particle moving in the earth's gravitational field in the same horizontal, northward direction? What is the direction of the minimum magnetic field?
(a) Magnitude = 3. 61 × 10⁴ T, Direction = West
(b) Magnitude = 3. 61 × 10⁴ T, Direction = East
(c) Magnitude = 3. 61 × 10⁴ T, Direction = North
(d) Magnitude = 3. 61 × 10⁴ T, Direction = South