Physics, asked by anitta86, 1 year ago

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Answered by BrainlyGod
1

Answer:

1.26 amp or 1.2 A (b)

Explanation:

According to the given question,

3 and 0.5 ohm resistors are in series whereas 10 and 15 ohm resistors are in parallel to each other.

Voltage = 20 V

And we are asked to find current through 10 ohm resistor.

So, we know for series combination,

  • R = R1+R2

R1 and R2 are in series combination.

And again, for parallel combination,

  • 1/R = 1/R1 + 1/R2

R1 and R2 are in parallel combination.

Where R is equivalent resistance in both case.

  • So, R = 3+0.5 = 3.5 Ohm

(As they are in series)

Where R is equivalent resistance of series combination.

  • 1/R' = 1/10 + 1/15

(As they are in parallel)

Where R' is equivalent resistance of parallel combination.

  • R' = 10×15/25

  • R' = 6 ohm

Now, these 6 ohm and 3.5 ohm are in again series combination.

Hence, Req = 6+3.5 = 9.5 ohm

So, Current in the circuit will be according to ohm law,

  • V= IR

  • I = V/R

  • I = 20/9.5

  • I= 2.10 amp ( approx )

Now current through 10 ohm will be known by potential difference between 10 ohm.

So, Potential drop by 3.5 resistance

  • V = 2.10 × 3.5

  • V = 7.36 V

Hence, Potential difference between the 10 ohm resistor is, 20-7.36 = 12.64 V

Alternatively,

  • V = IR

  • V = 2.10× 6

  • V = 12.6 V

So, Current in the 10 ohm resistance is;

  • V = IR

  • I = V/R

  • I = 12.6/10

  • I = 1.26 Amp ans.

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