In a potentiometer experiment, if the null point is found at 75cm with a known emf of 1.5V, what is the potential gradient if the total length of the wire is 150cm?
Practice Questions
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Q1
In a potentiometer experiment, if the null point is found at 75cm with a known emf of 1.5V, what is the potential gradient if the total length of the wire is 150cm?
1 V/m
2 V/m
3 V/m
4 V/m
The potential gradient is V/L = 1.5V/0.75m = 2 V/m.
Questions & Step-by-step Solutions
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Q
Q: In a potentiometer experiment, if the null point is found at 75cm with a known emf of 1.5V, what is the potential gradient if the total length of the wire is 150cm?
Solution: The potential gradient is V/L = 1.5V/0.75m = 2 V/m.
Steps: 8
Step 1: Understand that the null point in a potentiometer experiment indicates where the potential difference is equal to the emf being measured.
Step 2: Note the given values: the null point is at 75 cm and the known emf is 1.5V.
Step 3: Convert the null point from centimeters to meters: 75 cm = 0.75 m.
Step 4: The total length of the wire is given as 150 cm, which is equal to 1.5 m.
Step 5: Calculate the potential gradient using the formula: Potential Gradient = V / L, where V is the emf and L is the length of the wire up to the null point.
Step 6: Substitute the values into the formula: Potential Gradient = 1.5V / 0.75m.
