Class 12 Physics simulations · Moving Charges and Magnetism

Moving-coil galvanometer

Current in a coil within a radial magnetic field produces a torque balanced by a spring.

Open the simulation

What to notice

The radial field keeps the torque proportional to current, so the scale is linear.

Key relation

θ = NABI / k

Try this

Double the number of turns. How does the current sensitivity change?

What you can change

• Current I: 0 to 100 μA
• Turns N: 10 to 500
• Coil area: 1 to 10 cm²
• Magnetic field: 0.05 to 0.5 T
• Spring constant k: 0.1 to 5 μN m/rad

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
• Force between parallel currents
• Magnetic field inside a solenoid
• Crossed fields: the velocity selector

See all Class 12 Physics simulations or every Physica simulation.