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Download to investigate the induced EFM and current in a moving wire
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Transcript
7.1. Induced EMF and current in a moving wire Aim: to investigate the induced EFM and current in a moving wire. Apparatus: from the Low-Tech kit you will need: • digital multimeter, • wire, • strong magnet. Photo 1. The experimental set-up for presentation the induced EFM and current in a moving wire. Procedure: Put on the table strong magnet and digital multimeter. Connect the wire to the multimeter to measure the voltage. Switch on the multimeter. Move the wire fast across a magnetic filed. What can you observe? Explanation: When a wire is moved across a magnetic field, a small EMF (voltage) in generated in the wire. The effect is called Faraday's electromagnetic induction. If the wire forms part of a complete circuit, the EFM makes a current flow. The small voltage can be measure by digital multimeter. The induced EFM (and current) can be increased by: • moving the wire faster, • using the stronger magnet, • increasing the length of wire in the magnetic field – for example by loping the wire through the field several times.
