A student sends a 100 A current through a 2.0 cm wide and 200.0 μm thick copper strip. The current flows in the y-direction. The strip lies in the (x, y) plane and is perpendicular to the magnetic field of magnitude 1.40 T directed along the positive z-axis, as shown in the figure. A Hall potential difference (V) appears across the width of the strip. The number of free electrons per unit volume of copper is 8.47 × 10²⁸ electrons/m³. i) What is the electrons' drift velocity magnitude in the y-direction? ii) What are the magnitude and direction of the electric field due to the Hall Effect? iii) Determine the Hall emf.

Which of the following represents the equation for magnetic force between two moving charges?

Which of the following factors determines the direction of the magnetic force between two moving charges?

In a real-world scenario, which force would be dominant between two charges moving at high velocities: magnetic or electric? Consider typical charge magnitudes and distances in your evaluation.

What is a real-world example where the force between parallel currents is utilized?