which is used to fix the magnitude of the current through a circuit.
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o fix the magnitude of the current through a circuit is tungsten
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Explanation: The rheostat is a device which acts like a variable resistor that is used to control the “flow of current” in a circuit. Rheostat in Greek means, current controlling device. By varying the resistance of the rheostat across the circuit, it adjusts the magnitude of the current without interrupting the flow.
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