Question

it's urgent please answer it soon this is class 10th questions​

Answer 1

Answer:

Explanation:

3) Ohm’s law states that the current (I) flowing through a conductor is directly proportional to the potential difference (V) across the ends of the conductor,provided physical conditions of the conductors such as temperature,mechanical strain etc. Are kept constant i.e. IαV

Or VαI or V= RI

Or V/I=R=a constant

Where R is known as resistance of the conductor . It depends upon the length ,shape and the nature of the material of the conductor. The variation between potential difference (V) and current (I) through a conductor is a straight line.

Deduction of Ohm’s Law:

As drift velocity is given by Vd=eEt/m

But Electric field across the conductor of length l is

E=V/l

Thus Vd=e V/ml

Also, I=Anevd

By putting value of vd in the equation of I (equation 1 of relation of the current and drift velocity),we get

I=Ane(eV/ml)=(Ane2/ml)V

Or V/I=ml/Ane2=R

Where R is a constant for a given conductor. It is known as the resistance of the conductor.

Thus V=IR

4)The resistance of the conductor depends on the following factors:

The temperature of the conductor

The cross-sectional area of the conductor

Length of the conductor

Nature of the material of the conductor

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