Question
Download Solution PDFA simple slide wire potentiometer is used for measurement of current in a circuit. The voltage drop across a standard resistor of 0.2 Ω is balanced at 75 cm. Find the magnitude of the current if the standard cell emf of 1.5 V is balanced at 50 cm.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe standard cell emf 1.5 volt is balanced at 50 cm
The voltage drop per unit length = 1.5/50 = 30 mV/cm
The voltage drop across a standard resistor of 0.2 Ω is balanced at 75 cm
The voltage drop across 75 cm length = 30 × 10-3 × 75 = 2.25 V
The resistance of 75 cm length wire = 0.2 Ω
Current through the circuit = 2.25/0.2 = 11.25 A
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