A particle with a charge of -8.0x10-18 C moves to the left at a speed of 4x103 m/s. It enters a region with a uniform E- and B-field. The E-field has a magnitude of 0.5 N/C and points vertically downward. As the particle enters the region of the E- and B-field, it continues moving to the left at a constant speed. No deflection is observed. Neglect the effects of the Earth's gravitational and magnetic field on the particle. Determine the magnitude and direction of the B-field. Clearly show all steps, starting from generalized equations. Your explanation should cover both what you did and the thought process behind why you did that.

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.