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

0.4 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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