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Next, connect the silicon solar cell and the galvanometer as shown. Arrange the compass so that the coil lines up with the needle.
When you expose the solar cell to light (either sunlight or the light from a flashlight or table lamp), the compass needle will move. Here’s why: The electric current produced by the solar cell flows through coil and produces a weak magnetic field in the E-W direction. This magnetic field tries to pull the compass needle in that direction.