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JAMB Physics 2019 Paper

Question : 48

Total: 100

Solution:

Concept:

In a series circuit, the potential difference across each resistor is proportional to its resistance.

Explanation:

First, find the total resistance:

R_{\text{total}} = 200\Omega + 500\Omega + 1000\Omega = 1700\Omega

The supply voltage is

6\text{V}

The voltage across the

200\Omega

resistor is given by the voltage divider rule:

V_{200} = \frac{R_{200}}{R_{\text{total}}} \times V_{\text{supply}}

V_{200} = \frac{200}{1700} \times 6

V_{200} = \frac{1200}{1700} = 0.7059\text{V}

Rounded to two decimal places, this is

0.71\text{V}

Answer:

The potential difference across the

200\Omega

resistor is

0.71\text{V}

. Option A.

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