NSEP · Electricity & Magnetism
Biot-Savart, Ampere's law, forces on charges/currents, magnetic materials.
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Q1 · Magnetic Effects & Materials · MEDIUM
A charged particle of mass m and charge q enters a region of uniform magnetic field B perpendicular to its velocity v. If the particle exits the field region after tracing a quarter circle, the time spent in the field is:
Q2 · Magnetic Effects & Materials · MEDIUM
A proton moving with velocity v enters a region of uniform magnetic field B perpendicular to its velocity. If the proton completes a semicircle of radius r inside the field region, the time spent inside the field is:
Q3 · Magnetic Effects & Materials · EASY
A circular coil of radius 10 cm carries a current of 2 A. The magnetic field at its center is approximately: (μ₀ = 4π × 10⁻⁷ T·m/A)