Analog meter loading: For a 20,000 Ω/volt voltmeter set to its 5 V range, determine the internal resistance presented to the circuit.

Introduction / Context:
The Ω/volt rating indicates how much resistance a voltmeter exhibits per volt of full-scale range. This parameter matters because finite internal resistance can load the circuit and alter the measured voltage, especially in high-resistance networks.

Given Data / Assumptions:

• Sensitivity: 20,000 Ω/V.
• Range: 5 V.
• Use R_internal = (Ω/V) × (range).

Concept / Approach:

On each higher voltage range, additional series resistance is introduced so that the meter movement sees the correct full-scale current. Therefore the presented resistance scales linearly with range setting, following the product rule above.

Step-by-Step Solution:

Verification / Alternative check:

On a 10 V range, the same instrument would show 200 kΩ; on 1 V, 20 kΩ. The proportionality confirms the logic.

Why Other Options Are Wrong:

20,000 Ω corresponds to 1 V range, not 5 V. 200,000 Ω would be the 10 V range value. 1,000,000 Ω implies 200,000 Ω/V sensitivity, not 20,000 Ω/V.

Common Pitfalls:

Forgetting to multiply by the selected range; confusing Ω/V with kΩ/V; overlooking how meter loading changes with range.

Final Answer:

100,000 Ω