Lab 2 Handout Mapping E-field-1


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Unformatted text preview: apping board where no current flows through the galvanometer, then you know that the electric potential at that location on the board is 2.5 V. This is a simple example of a “null” measurement. The resistor on the key switch protects the galvanometer by limiting the current and making the circuit less sensitive. Closing the key switch bypasses the resistor, and maximizes the sensitivity of the circuit. When mapping an equipotential as above, first position the probe, with the key open, so that the galvanometer current is zero. Then, close the key switch to make the circuit more sensitive. Move the probe so that the galvanometer current is again zero. Mark the probe position on the paper. 5 5 Before you begin measurements: Watch the instructor walking you through the circuit before you start connecting things up!!! NM Phys182 S2013 Lab2 Understand the functions of the various components provided to you, such as the power supply, voltmeter, galvanometer and probe. On the underside of the field mapping board, the probe contacts the conductive...
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This note was uploaded on 05/06/2013 for the course PHYSICS 184 taught by Professor Menon during the Spring '13 term at UMass (Amherst).

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