Physics · JEE

Torque experienced by a current loop in a uniform magnetic field: Moving coil galvanometer, its sensitivity and conversion to ammeter and voltmeter Concepts for JEE

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Master Torque experienced by a current loop in a uniform magnetic field: Moving coil galvanometer, its sensitivity and conversion to ammeter and voltmeter by understanding definitions, standard results, and typical JEE question patterns — then practise with syllabus-aligned MCQs on Goodmarks.

Build clear conceptual foundations for Torque experienced by a current loop in a uniform magnetic field: Moving coil galvanometer, its sensitivity and conversion to ammeter and voltmeter before speed practice. This guide covers what JEE expects and how to test yourself with MCQs.

Concept explainer

Torque experienced by a current loop in a uniform magnetic field: Moving coil galvanometer, its sensitivity and conversion to ammeter and voltmeter is a core JEE Main Physics subtopic under Magnetic Effects of Current and Magnetism. Master the definitions, standard results, and typical MCQ patterns tested in JEE Main and Advanced.

Key points

Understand the definition and scope of Torque experienced by a current loop in a uniform magnetic field: Moving coil galvanometer, its sensitivity and conversion to ammeter and voltmeter in the JEE syllabus
Memorise key formulas and standard results linked to Torque experienced by a current loop in a uniform magnetic field: Moving coil galvanometer, its sensitivity and conversion to ammeter and voltmeter
Practise 20–40 syllabus-aligned MCQs with step-by-step solutions

JEE tips

Revise Torque experienced by a current loop in a uniform magnetic field: Moving coil galvanometer, its sensitivity and conversion to ammeter and voltmeter with a one-page formula sheet before attempting mixed tests
After each practice set, log mistakes specific to Torque experienced by a current loop in a uniform magnetic field: Moving coil galvanometer, its sensitivity and conversion to ammeter and voltmeter and reattempt after 48 hours

Common trap

Students often rush Torque experienced by a current loop in a uniform magnetic field: Moving coil galvanometer, its sensitivity and conversion to ammeter and voltmeter questions without checking units, sign conventions, or boundary conditions — always verify assumptions before calculating.

Syllabus context

Part of Magnetic Effects of Current and Magnetism in JEE Main Physics.

Free sample questions

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Q1PhysicsUnit 13: Magnetic Effects of Current and Magnetism

A moving coil ammeter requires a potential difference of

0.4 V

across it for full scale deflection. It has fixed shunt resistance of 0.01 ohm with a coil circuit resistance of

\boldsymbol{R}=\mathbf{1} \boldsymbol{k}

ohm. The value of shunt required to give full scale deflection when the total current is

10 A

is equal to

Q2PhysicsUnit 13: Magnetic Effects of Current and Magnetism

The pole is pieces of a horse-shoe magnet are made cylindrical so that the deflection of the coil is proportional to

Q3PhysicsUnit 13: Magnetic Effects of Current and Magnetism

Assertion The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil. Reason Soft iron has a high magnetic permeability and cannot be easily magnetized or demagnetized.

Q4PhysicsUnit 13: Magnetic Effects of Current and Magnetism

A planar coil of area

7 \mathrm{m}^{2}

carrying an anti-clockwise current 2 A is placed in an extemal magnetic field

\vec{B}=(0.2 \hat{i}+

0.2 \hat{j}-0.3 \hat{k}),

such that the normal to the plane is along the

\operatorname{line}(3 \hat{i}-5 \hat{j}+

\hat{k}

). Select correct statements from the following. ( Consider Normal of the coil and Magnetic moment vectors to be in the same direction This question has multiple correct options

Q5PhysicsUnit 13: Magnetic Effects of Current and Magnetism

Sensitivity of a moving coil galvanometer can be increased by Fill in the blank.

Q6PhysicsUnit 13: Magnetic Effects of Current and Magnetism

The rigid conducting thin wire frame carries an electric current

I

and this frame is inside a uniform magnetic field

\vec{B}

as shown in fig. Then

Q7PhysicsUnit 13: Magnetic Effects of Current and Magnetism

Assertion A galvanometer can be used as a voltmeter to measure the voltage across a given section of the circuit. Reason For this it must be connected in parallel with that section of the circuit.

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Frequently asked questions

What concepts in Torque experienced by a current loop in a uniform magnetic field: Moving coil galvanometer, its sensitivity and conversion to ammeter and voltmeter are essential for JEE?

Focus on core ideas across Torque experienced by a current loop in a uniform magnetic field: Moving coil galvanometer, its sensitivity and conversion to ammeter and voltmeter. JEE tests application, not just memorisation.