Physics Class 10 Practical 31 Important Viva Questions with Answers Verify Ohm’s law (To find the resistance of galvanometer by half deflection method).

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Conceptual Viva Questions and Answers

Question 1: What is the principle behind the half deflection method to find the resistance of a galvanometer? 
Answer: The principle involves using a known shunt resistance to produce a deflection that is half of the original deflection when only the galvanometer is used, allowing the calculation of the galvanometer's internal resistance.

Question 2: Why is the half deflection method used to determine the resistance of a galvanometer?
Answer: It provides a straightforward way to measure the galvanometer's resistance accurately by balancing the deflections, making the calculations simpler and more precise.

Question 3: What is a shunt resistance? 
Answer: A shunt resistance is a resistor placed parallel to the galvanometer to allow a known fraction of current to bypass the galvanometer, used to control the deflection and measure the internal resistance.

Question 4: How do you connect the circuit for the half deflection method? 
Answer: Connect the galvanometer in series with a known resistor and a voltage source. Then, connect a shunt resistor parallel to the galvanometer and adjust it to achieve half the initial deflection.

Question 5: What formula is used to calculate the resistance of the galvanometer using the half deflection method? 
Answer: The resistance of the galvanometer (G) is given by G=Rs(I−1), where Rs is the shunt resistance and I is the initial current when only the galvanometer is connected.

Question 6: Why is it important to achieve exactly half deflection in this method?
Answer: Achieving exactly half deflection ensures that the current through the galvanometer is halved, which simplifies the calculation and ensures accuracy.

Question 7: What precautions should be taken during the experiment? 
Answer: Ensure all connections are secure, use precise resistors, avoid parallax errors while reading the galvanometer, and verify that the shunt resistor is correctly adjusted to achieve half deflection.

Question 8: What does the initial deflection represent in this experiment? 
Answer: The initial deflection represents the current passing through the galvanometer without the shunt resistor, providing a baseline for calculating the half deflection.

Question 9: What is the significance of using a high resistance in series with the galvanometer initially?
Answer: Using a high resistance limits the current through the galvanometer, protecting it from potential damage due to high currents and ensuring accurate measurements.

Question 10: Can this method be used for any type of galvanometer? 
Answer: Yes, the half deflection method can be used for any galvanometer as long as the galvanometer and shunt resistor are properly matched and the deflection can be accurately measured