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

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

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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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