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Electrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer questions with solutions
Practice Current electricity for JEE Main, JEE Advanced, NEET, and Classes 11–12. Attempt each question, then open it for the full solution.
Showing 1–10 of 88 questions
- NumericmediumCurrent electricity
In the figure shown for which values of R₁ and R₂ the balance point for Jockey is at 40 cm from A. When R₂ is shunted by a resistance of 10 Ω, balance shifts to 50 cm. Find R₂ (in Ω). (AB = 1 m):
JEE Advanced
Open question & full solution → - MCQmediumCurrent electricity
A resistance R is measured using a metre bridge with standard resistance S = 100 Ω. The null point is at ℓ₁ = 2.9 cm. Which change would usefully improve the accuracy?
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JEE Mains
Open question & full solution → - NumericmediumCurrent electricity
To measure the internal resistance r₁ of a cell of emf E, a metre bridge of wire resistance R₀ = 50 Ω, a resistance R₀/2, another cell of emf E/2 (internal resistance r) and a galvanometer are connected as shown. If the null point is at ℓ = 72 cm, find r₁ in ohms.
JEE Advanced 2021
Open question & full solution → - ParagraphmediumCurrent electricity
A galvanometer of resistance 99 Ω is converted into an ammeter using a 1 Ω shunt and connected as in figure (i); the ammeter reads 3 A. The same galvanometer is converted into a voltmeter using a 101 Ω series resistance and connected as in figure (ii); the voltmeter reads 4/5 of full scale. Answer the following
.
Sub-question 1
Find the internal resistance r of the cell (in Ω).
Sub-question 2
Find the ranges of the ammeter and voltmeter.
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Sub-question 3
Find the full-scale deflection current of the galvanometer (in A).
JEE Advanced
Open question & full solution → - NumericmediumCurrent electricity
In the experiment to determine the galvanometer resistance by half-deflection method, the plot of 1/θ vs the resistance (R) of the resistance box is shown in the figure. The figure of merit of the galvanometer is ______ × 10⁻¹ A/division. [The source has emf 2V]
JEE Mains 2024 05 Apr Morning Shift
Open question & full solution → - MCQmediumCurrent electricity
In an ammeter, 5% of the main current passes through the galvanometer. If resistance of the galvanometer is G, the resistance of ammeter will be:
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JEE Mains 2024 01 Feb Evening Shift
Open question & full solution → - MCQmediumCurrent electricity
To measure the internal resistance of a battery, potentiometer is used. For R = 10 Ω, the balance point is observed at ℓ = 500 cm and for R = 1 Ω the balance point is observed at ℓ = 400 cm. The internal resistance of the battery is approximately:
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JEE Mains 2024 04 Apr Morning Shift
Open question & full solution → - MCQmediumCurrent electricity
A galvanometer coil has a resistance 90Ω and full-scale deflection current 10 mA. A 910Ω resistance is connected in series with the galvanometer to make a voltmeter. If the least count of the voltmeter is 0.1V, the number of divisions on its scale is
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JEE MainsNEET
Open question & full solution → - MCQmediumCurrent electricity
In the figure shown PQ is a potentiometer wire. When galvanometer is connected at A, it shows zero deflection when PJ = x. Now the galvanometer is connected to B and it shows zero deflection when PJ = 3x. Find the value of unknown resistance Rₓ in term of R.
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Current Electricity Objective Conversion
Open question & full solution → - MCQeasyCurrent electricity
The resistance per centimeter of a meter bridge wire is r, with X Ω resistance in left gap. Balancing length from left end is at 40 cm with 25 Ω resistance in right gap. Now the wire is replaced by another wire of 2r resistance per centimeter. The new balancing length for same settings will be at
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JEE Mains 2024 31 Jan Evening Shift
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