PHY_121-tutorial_questions_and_solution[1].docx

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1. Calculate the Rx when the bridges balance 2. The following unbalanced Wheatstone Bridge is constructed. Calculate the output voltage across points C and D and the value of resistor R 4 required to balance the bridge circuit. For the first series arm, ACB For the second series arm, ADB R 1 = 750 Ω R x R var = 200Ω R3 = 800Ω
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The voltage across points C-D is given as: The value of resistor, R 4 required to balance the bridge is given as: 3. Calculate the Potentiometer for the given details. R1 (amps) = 25 R2 (amps) = 15 rl (amps) = 10 vs(volts) = 5 4. In Wheatstone bridge P = 9 ohm, Q = 11 ohm, R = 4 ohm and S = 6 ohm. How much resistance must be put in parallel to the resistance S to balance the bridge (A) 24 ohm (B) 44/9 ohm (C) 26.4 ohm (D) 18.7 ohm Solution: (C) (For balancing bridge) S' = 4×11/9 = 44/9 1/S' = 1/r + 1/6 9/44 – 1/6 = 1/r r = 132/5 = 26.4 Ω 5. Solved example 2 : A voltmeter having a resistance of 998 ohms is connected to a cell of emf 2 volt and internal resistance 2 ohm. The error in the measurement of emf will be (A) 4 ×10–1 volt (B) 2 ×10–3 volt (C) 4 ×10–3 volt (D) 2 ×10–1 volt
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