Question

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Answer 1

Answer:

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Explanation:

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Answer 2

$\huge\underline\mathfrak{Question:-}$

☞State Ohm's law. How can it be experimentally verified?

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$\huge\underline\mathfrak{Required\: Answer:-}$

➢ $\underline\mathtt\purple{Ohm's \:Law:}$

It states that "Physical conditions remaining same, the current flowing through a conductor is directly proportional to the potential difference across its two ends". i.e.,

V∝I

V =IR

where the constant of proportionality R is called the electrical resistance or resistance of the conductor.

➢$\underline\mathtt\purple{Experiment\: to\: verify \:ohm's \:law:}$

Procedure :

1. Connect the various components as

2. Close the sky, so that current begins to flow in the circuit.

3. Note down the potential difference (V) across the conductor PQ of resistance R shown by the voltmeter and the corresponding current (I) shown by the ammeter.

4. Now move the knob of rheostat so that the current in the circuit increases.

5. Again note down the potential difference (V) across the conductor R in the voltmeter and current in the circuit shown by ammeter.

6. Repeat the experiment five times by increasing the current in the circuit by moving the knob of the rheostat in steps.

The value of V/I = R (constant) Plot a graph between V and I by taking V along X- axis along. We get a straight line passing through origin.

Conclusion :

• From the graph between V and I, we conclude that I = V, which is Ohm's law.
• Hence Ohm's law is verified experimentally.
• Ohm's law does not hold under all conditions.
• Ohm's law does not hold for non-ohmic material such as electrotyte.

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