Class 12 Physics simulations · Electric Charges and Fields

Electron beam between deflecting plates

Accelerate electrons, then pass them between charged plates. The beam bends into a parabola and hits the screen.

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What to notice

Inside the plates the path is a parabola; after leaving, the electron travels in a straight line.

Key relation

y = V_d L² / (4 d V_a) ; Y = (V_d L / 2dV_a)(L/2 + D)

Try this

Double the accelerating voltage. How does the spot move?

What you can change

• Accelerating voltage: 500 to 5000 V
• Deflecting voltage: 0 to 200 V
• Plate length: 2 to 6 cm
• Plate separation: 0.5 to 2 cm
• Plates to screen: 10 to 30 cm

More in Electric Charges and Fields

• Electric field on a ring axis
• Field of a charged sphere
• Coulomb force vs separation
• Electric dipole potential
• Electric dipole in a uniform field
• Electric field of two charges
• Gauss’s law: charge and a cube
• Gauss’s law on a sphere

See all Class 12 Physics simulations or every Physica simulation.