Finding the magnitide and direction of the magnetic force acting on a proton

Question

Assuming, you are given a simple resistance circuit consisting of two resistors, where R1= 10Ω, R1= 25Ω, with a supplied voltage of 100 V. The two resistors are connected in parallel. The battery branch of the circuit is very far from the two horizontal segments containing the two resistors connected. These horizontal segments are both separated by a distance of 3.33 cm, and they are much longer than the separation itself. A proton is fired at a speed of 750 km/s from a point that is 1/3 (one-third) above the 10Ω resistor in between the two horizontal segments. The initial velocity of the proton is in the plane of the circuit and is directed toward the upper wire. How will you find the magnitude and direction of the initial magnetic force on the proton?

Answer 1