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Two resistors 400 Ω and 800 Ω are connected in series across a 6 V battery. The potential difference measured by a voltmeter of 10 kΩ across 400 Ω resistor is close to

Asked in JEE Main 3rd Sept 2nd Shift 2020 · Ammeters and voltmeters in circuits

• (1) 2 V
• (2) 1.8 V
• (3) 2.05 V
• (4) 1.95 V

Step-by-step solution

Why the other options are wrong

• (1) Treats the voltmeter as ideal: 6×(400)/(1200)=2 V, ignoring its loading.
• (2) No standard slip gives this; it overestimates the loading effect several times.
• (3) Corrects in the wrong direction; a real voltmeter always reads less than the unloaded 2 V.

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