PHYSICAClass 12 Physics simulations · Moving Charges and Magnetism
Crossed fields: the velocity selector
Send a proton through perpendicular electric and magnetic fields and find the straight-through speed.
What to notice
At the selected speed, electric and magnetic forces cancel. Faster and slower particles bend oppositely.
Key relation
Selected speed = E/B
Try this
Use the matched-speed preset and reveal the force directions.
What you can change
- Electric field (upward): 100 to 1000 N/C
- Magnetic field (out of page): 1 to 5 mT
- Proton entry speed: 1 to 8 ×10⁵ m/s
More in Moving Charges and Magnetism
- Cyclotron frequency
- Force on a current-carrying wire
- Helical motion in a magnetic field
- Magnetic field on the axis of a loop
- Charged particle in a field
- Galvanometer to ammeter or voltmeter
- Moving-coil galvanometer
- Force between parallel currents
- Magnetic field inside a solenoid
See all Class 12 Physics simulations or every Physica simulation.