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Effective resistance of B and C is equal to the resistance of voltmeter A. Find the equivalent resistance.

1. RB + RC = 1.5R × 3R / 1.5R + 3R
2. 4.5R² / 4.5R = R
3. RB + RC = 1.5R × 3R / 4.5R
4. RB + RC = 4.5R² / 4.5R = R

Correct answer: RB + RC = 1.5R × 3R / 4.5R

Solution

The effective resistance of B and C in parallel is calculated using the formula for parallel resistances: (R1 × R2) / (R1 + R2). Substituting the given values, the correct expression is RB + RC = 1.5R × 3R / 4.5R.

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