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

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Revision checklist

  1. 1.Core idea: Torque experienced by a current loop in a uniform magnetic field: Moving coil galvanometer, its sensitivity and conversion to ammeter and voltmeter
  2. 2.Relates to other subtopics in Magnetic Effects of Current and Magnetism
  3. 3.Force on moving charge and current in B-field
  4. 4.Biot-Savart, Ampere's law
  5. 5.Master Torque experienced by a current loop in a uniform magnetic field: Moving coil galvanometer, its sensitivity and conversion to ammeter and voltmeter definitions and standard results
  6. 6.Solve 20 timed MCQs for Torque experienced by a current loop in a uniform magnetic field: Moving coil galvanometer, its sensitivity and conversion to ammeter and voltmeter

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 0.4V0.4 V across it for full scale deflection. It has fixed shunt resistance of 0.01 ohm with a coil circuit resistance of R=1k\boldsymbol{R}=\mathbf{1} \boldsymbol{k} ohm. The value of shunt required to give full scale deflection when the total current is 10A10 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 7m27 \mathrm{m}^{2} carrying an anti-clockwise current 2 A is placed in an extemal magnetic field B⃗=(0.2i^+\vec{B}=(0.2 \hat{i}+ 0.2j^−0.3k^),0.2 \hat{j}-0.3 \hat{k}), such that the normal to the plane is along the line⁡(3i^−5j^+\operatorname{line}(3 \hat{i}-5 \hat{j}+ 4 k^\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 II and this frame is inside a uniform magnetic field B⃗\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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