What is the purpose of the resistor connected in series with the galvanometer in a Wheatstone bridge? What would happen if it were initially set to 0 ohms rather than to 500 ohms?

An Introduction to Physical Science
14th Edition
ISBN:9781305079137
Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres
Publisher:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres
Chapter8: Electricity And Magnetism
Section8.3: Simple Electric Circuits And Electrical Safety
Problem 8.2CE
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What is the purpose of the resistor connected in series with the galvanometer in a Wheatstone bridge? What would happen if it were initially set to 0 ohms rather than to 500 ohms?

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