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In fig 8 the value of R is…

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PHYSICS

In fig 8, the value of R is

In fig 8 the value of R is

A. 3Ω

B. 6Ω

C. 4Ω

D. 5Ω

QUICK ANSWER…

B

DETAILS…  

To solve this, we need to solve for the effective resistance of the whole circuit, and then use the supplied voltage and ammeter reading to solve for R.

To find the effective resistance, observe that 6Ω and R are in parallel and these two in series with the 3Ω resistor.

Firstly, resolving the parallel 6Ω and R, we have the effective resistance X as:

In fig 8, the value of R is

Now for the right answer to the above question:

  1. A is not the right answer.
  2. B is correct.
  3. C is incorrect.
  4. D is incorrect. not vaporization point.

KEY-POINTS…

You may please note this/these:

  • Use the given voltage and current to calculate the value of R.
  • Get the expression for R by finding the effective resistance of the arrangement.

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/ culled from 2020 JAMB-UTME physics past question 36 /

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