Question on: JAMB Physics - 2019

In a slide wire bridge, the balance is obtained at a point 25cm from one end of wire 1m long. The resistance to be tested is connected to that end and a standard resistance of 3.6\(\Omega\) is connected to the other end of the wire. Determine the value of the unknown resistance

A

3.2\(\Omega\)

B

1.4\(\Omega\)

C

3.21\(\Omega\)

D

1.2\(\Omega\)

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Correct Option: D

 

\(\frac{R}{3.6} = \frac{75}{25} = \frac{1}{3}\)

3R = 3.6

R = 1.2\(\Omega\)

Answer: 1.2\(\Omega\)

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