Overhead Galvanometer with Coils - Physics Demonstrations - Overhead Galvanometer with Coils | Physics Undergraduate Labs

Purpose

Three coils with different turn counts (30, 50, 90) are connected in series to an overhead galvanometer. Moving a bar magnet through each coil shows that induced EMF scales with $$N$$ , depends on the rate of flux change, and reverses with magnet orientation.

Overhead projection showing galvanometer face (2 mA DC, scale -2 to +2) with silhouettes of three coils visible to the right

Clear acrylic board with galvanometer (red scale markings, 2 mA DC), three red copper wire coils of increasing size mounted on right, and bar magnet with S and N poles labeled below

Figure 1: Overhead projection of the galvanometer and coil assembly, showing the meter face and silhouettes of the three coils.

Figure 2: Complete apparatus: overhead galvanometer with three coils (30, 50, 90 turns) on acrylic board, with bar magnet.

Overhead Galvanometer

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