Question

A current of 1A flows through a wire of length 0.24m &area of cross section 1.2mm2.,when it is connected to a battery of 3V. Find the no. Density of free electron in the wire, if the electron mobility is 4.8x10*-6

Answer 1

Explanation:

Three resistors each of 3Ω

A battery of 10 Volt

To Find:

Current across one of the 3 ohm resistors

Solution:

We know that,

In series combination

Current through each resistance is same as that of main current flowing through the circuit i.e. I=I₁=I₂=I₃=.......

Equivalent resistance is equal to the sum of individual resistances

i.e.

For a circuit,

where

I is current flowing through circuit

V is potential across battery

R is resistance of circuit

Now,

Let the equivalent resistance of given circuit be R

So,

Now,

Let the current flowing through the circuit be I

So,

Therefore, current flowing through across each of the 3Ω resistor is 10/9 A.

Hence, the required current is 10/9 A.

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