02. Moving Coil Galvanometer and Magnetic Device
Magnetism and Matter

154205 For moving coil galvanometer, the deflection in the coil is 0.05 rod when a current of $10 \mathrm{~mA}$ is passed through it. If the torsional constant of suspension wire is $4.0 \times 10^{-5} \mathrm{Nm} \mathrm{rad}^{-1}$, the magnetic field is $0.01 \mathrm{~T}$ and the number of turns in the coil is 200 , the area of each turn (in $\mathbf{c m}^{2}$ ) is :

1 2.0
2 1.0
3 1.5
4 0.5
Magnetism and Matter

154206 The number of turns of the coil of a moving coil galvanometer is increased in order to increase current sensitivity by $50 \%$. The percentage change in voltage sensitivity of the galvanometer will be:

1 $50 \%$
2 $75 \%$
3 $0 \%$
4 $100 \%$
Magnetism and Matter

154207 Statement (A) : The restoring couple in the moving coil galvanometer is due to the current in the coil
Statement(B): Wires of magnetic field around a current carrying straight conductor will be circular in a plane parallel to the conductor Statement(C): When a charged particle enters a uniform magnetic field, its kinetic energy increases

1 A,B C are true
2 A,B true, $\mathrm{C}$ is false
3 A,C true, B is false
4 A,B C are false
Magnetism and Matter

154208 The coil of a moving coil galvanometer has an effective area of $4 \times 10^{-2} \mathrm{~m}^{2}$. It is suspended in a magnetic field of $5 \times 10^{-2} \mathrm{Wbm}^{-2}$. If the deflection in the galvanometer coil is 0.2 rad when a current of $5 \mathrm{~mA}$ is passed through it, then

1 Torsional constant is $8 \times 10^{-5} \mathrm{~N} \mathrm{mrad}^{-1}$
2 Current sensitivity is $40 \mathrm{rad} \mathrm{A}^{-1}$
3 Torsional constant is $3 \times 10^{-3} \mathrm{nmrad}^{-1}$
4 Current sensitivity is $40 \mathrm{deg} \mathrm{A}^{-1}$
Magnetism and Matter

154209 Two galvanometers ' $A$ ' and ' $B$ ' require currents of $4 \mathrm{~mA}$ and $7 \mathrm{~mA}$, respectively to produce the same deflection of 20 divisions. If ' $S_{A}$ ' and ' $S_{B}$ ' are their sensitivities, respectively, then

1 $\mathrm{S}_{\mathrm{A}}=\mathrm{S}_{\mathrm{B}}=\frac{4}{7}$
2 $\mathrm{S}_{\mathrm{A}} \lt \mathrm{S}_{\mathrm{B}}$
3 $\mathrm{S}_{\mathrm{B}}=\frac{7}{4} \mathrm{~S}_{\mathrm{A}}$
4 $\mathrm{S}_{\mathrm{A}}>\mathrm{S}_{\mathrm{B}}$
Magnetism and Matter

154205 For moving coil galvanometer, the deflection in the coil is 0.05 rod when a current of $10 \mathrm{~mA}$ is passed through it. If the torsional constant of suspension wire is $4.0 \times 10^{-5} \mathrm{Nm} \mathrm{rad}^{-1}$, the magnetic field is $0.01 \mathrm{~T}$ and the number of turns in the coil is 200 , the area of each turn (in $\mathbf{c m}^{2}$ ) is :

1 2.0
2 1.0
3 1.5
4 0.5
Magnetism and Matter

154206 The number of turns of the coil of a moving coil galvanometer is increased in order to increase current sensitivity by $50 \%$. The percentage change in voltage sensitivity of the galvanometer will be:

1 $50 \%$
2 $75 \%$
3 $0 \%$
4 $100 \%$
Magnetism and Matter

154207 Statement (A) : The restoring couple in the moving coil galvanometer is due to the current in the coil
Statement(B): Wires of magnetic field around a current carrying straight conductor will be circular in a plane parallel to the conductor Statement(C): When a charged particle enters a uniform magnetic field, its kinetic energy increases

1 A,B C are true
2 A,B true, $\mathrm{C}$ is false
3 A,C true, B is false
4 A,B C are false
Magnetism and Matter

154208 The coil of a moving coil galvanometer has an effective area of $4 \times 10^{-2} \mathrm{~m}^{2}$. It is suspended in a magnetic field of $5 \times 10^{-2} \mathrm{Wbm}^{-2}$. If the deflection in the galvanometer coil is 0.2 rad when a current of $5 \mathrm{~mA}$ is passed through it, then

1 Torsional constant is $8 \times 10^{-5} \mathrm{~N} \mathrm{mrad}^{-1}$
2 Current sensitivity is $40 \mathrm{rad} \mathrm{A}^{-1}$
3 Torsional constant is $3 \times 10^{-3} \mathrm{nmrad}^{-1}$
4 Current sensitivity is $40 \mathrm{deg} \mathrm{A}^{-1}$
Magnetism and Matter

154209 Two galvanometers ' $A$ ' and ' $B$ ' require currents of $4 \mathrm{~mA}$ and $7 \mathrm{~mA}$, respectively to produce the same deflection of 20 divisions. If ' $S_{A}$ ' and ' $S_{B}$ ' are their sensitivities, respectively, then

1 $\mathrm{S}_{\mathrm{A}}=\mathrm{S}_{\mathrm{B}}=\frac{4}{7}$
2 $\mathrm{S}_{\mathrm{A}} \lt \mathrm{S}_{\mathrm{B}}$
3 $\mathrm{S}_{\mathrm{B}}=\frac{7}{4} \mathrm{~S}_{\mathrm{A}}$
4 $\mathrm{S}_{\mathrm{A}}>\mathrm{S}_{\mathrm{B}}$
Magnetism and Matter

154205 For moving coil galvanometer, the deflection in the coil is 0.05 rod when a current of $10 \mathrm{~mA}$ is passed through it. If the torsional constant of suspension wire is $4.0 \times 10^{-5} \mathrm{Nm} \mathrm{rad}^{-1}$, the magnetic field is $0.01 \mathrm{~T}$ and the number of turns in the coil is 200 , the area of each turn (in $\mathbf{c m}^{2}$ ) is :

1 2.0
2 1.0
3 1.5
4 0.5
Magnetism and Matter

154206 The number of turns of the coil of a moving coil galvanometer is increased in order to increase current sensitivity by $50 \%$. The percentage change in voltage sensitivity of the galvanometer will be:

1 $50 \%$
2 $75 \%$
3 $0 \%$
4 $100 \%$
Magnetism and Matter

154207 Statement (A) : The restoring couple in the moving coil galvanometer is due to the current in the coil
Statement(B): Wires of magnetic field around a current carrying straight conductor will be circular in a plane parallel to the conductor Statement(C): When a charged particle enters a uniform magnetic field, its kinetic energy increases

1 A,B C are true
2 A,B true, $\mathrm{C}$ is false
3 A,C true, B is false
4 A,B C are false
Magnetism and Matter

154208 The coil of a moving coil galvanometer has an effective area of $4 \times 10^{-2} \mathrm{~m}^{2}$. It is suspended in a magnetic field of $5 \times 10^{-2} \mathrm{Wbm}^{-2}$. If the deflection in the galvanometer coil is 0.2 rad when a current of $5 \mathrm{~mA}$ is passed through it, then

1 Torsional constant is $8 \times 10^{-5} \mathrm{~N} \mathrm{mrad}^{-1}$
2 Current sensitivity is $40 \mathrm{rad} \mathrm{A}^{-1}$
3 Torsional constant is $3 \times 10^{-3} \mathrm{nmrad}^{-1}$
4 Current sensitivity is $40 \mathrm{deg} \mathrm{A}^{-1}$
Magnetism and Matter

154209 Two galvanometers ' $A$ ' and ' $B$ ' require currents of $4 \mathrm{~mA}$ and $7 \mathrm{~mA}$, respectively to produce the same deflection of 20 divisions. If ' $S_{A}$ ' and ' $S_{B}$ ' are their sensitivities, respectively, then

1 $\mathrm{S}_{\mathrm{A}}=\mathrm{S}_{\mathrm{B}}=\frac{4}{7}$
2 $\mathrm{S}_{\mathrm{A}} \lt \mathrm{S}_{\mathrm{B}}$
3 $\mathrm{S}_{\mathrm{B}}=\frac{7}{4} \mathrm{~S}_{\mathrm{A}}$
4 $\mathrm{S}_{\mathrm{A}}>\mathrm{S}_{\mathrm{B}}$
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Magnetism and Matter

154205 For moving coil galvanometer, the deflection in the coil is 0.05 rod when a current of $10 \mathrm{~mA}$ is passed through it. If the torsional constant of suspension wire is $4.0 \times 10^{-5} \mathrm{Nm} \mathrm{rad}^{-1}$, the magnetic field is $0.01 \mathrm{~T}$ and the number of turns in the coil is 200 , the area of each turn (in $\mathbf{c m}^{2}$ ) is :

1 2.0
2 1.0
3 1.5
4 0.5
Magnetism and Matter

154206 The number of turns of the coil of a moving coil galvanometer is increased in order to increase current sensitivity by $50 \%$. The percentage change in voltage sensitivity of the galvanometer will be:

1 $50 \%$
2 $75 \%$
3 $0 \%$
4 $100 \%$
Magnetism and Matter

154207 Statement (A) : The restoring couple in the moving coil galvanometer is due to the current in the coil
Statement(B): Wires of magnetic field around a current carrying straight conductor will be circular in a plane parallel to the conductor Statement(C): When a charged particle enters a uniform magnetic field, its kinetic energy increases

1 A,B C are true
2 A,B true, $\mathrm{C}$ is false
3 A,C true, B is false
4 A,B C are false
Magnetism and Matter

154208 The coil of a moving coil galvanometer has an effective area of $4 \times 10^{-2} \mathrm{~m}^{2}$. It is suspended in a magnetic field of $5 \times 10^{-2} \mathrm{Wbm}^{-2}$. If the deflection in the galvanometer coil is 0.2 rad when a current of $5 \mathrm{~mA}$ is passed through it, then

1 Torsional constant is $8 \times 10^{-5} \mathrm{~N} \mathrm{mrad}^{-1}$
2 Current sensitivity is $40 \mathrm{rad} \mathrm{A}^{-1}$
3 Torsional constant is $3 \times 10^{-3} \mathrm{nmrad}^{-1}$
4 Current sensitivity is $40 \mathrm{deg} \mathrm{A}^{-1}$
Magnetism and Matter

154209 Two galvanometers ' $A$ ' and ' $B$ ' require currents of $4 \mathrm{~mA}$ and $7 \mathrm{~mA}$, respectively to produce the same deflection of 20 divisions. If ' $S_{A}$ ' and ' $S_{B}$ ' are their sensitivities, respectively, then

1 $\mathrm{S}_{\mathrm{A}}=\mathrm{S}_{\mathrm{B}}=\frac{4}{7}$
2 $\mathrm{S}_{\mathrm{A}} \lt \mathrm{S}_{\mathrm{B}}$
3 $\mathrm{S}_{\mathrm{B}}=\frac{7}{4} \mathrm{~S}_{\mathrm{A}}$
4 $\mathrm{S}_{\mathrm{A}}>\mathrm{S}_{\mathrm{B}}$
Magnetism and Matter

154205 For moving coil galvanometer, the deflection in the coil is 0.05 rod when a current of $10 \mathrm{~mA}$ is passed through it. If the torsional constant of suspension wire is $4.0 \times 10^{-5} \mathrm{Nm} \mathrm{rad}^{-1}$, the magnetic field is $0.01 \mathrm{~T}$ and the number of turns in the coil is 200 , the area of each turn (in $\mathbf{c m}^{2}$ ) is :

1 2.0
2 1.0
3 1.5
4 0.5
Magnetism and Matter

154206 The number of turns of the coil of a moving coil galvanometer is increased in order to increase current sensitivity by $50 \%$. The percentage change in voltage sensitivity of the galvanometer will be:

1 $50 \%$
2 $75 \%$
3 $0 \%$
4 $100 \%$
Magnetism and Matter

154207 Statement (A) : The restoring couple in the moving coil galvanometer is due to the current in the coil
Statement(B): Wires of magnetic field around a current carrying straight conductor will be circular in a plane parallel to the conductor Statement(C): When a charged particle enters a uniform magnetic field, its kinetic energy increases

1 A,B C are true
2 A,B true, $\mathrm{C}$ is false
3 A,C true, B is false
4 A,B C are false
Magnetism and Matter

154208 The coil of a moving coil galvanometer has an effective area of $4 \times 10^{-2} \mathrm{~m}^{2}$. It is suspended in a magnetic field of $5 \times 10^{-2} \mathrm{Wbm}^{-2}$. If the deflection in the galvanometer coil is 0.2 rad when a current of $5 \mathrm{~mA}$ is passed through it, then

1 Torsional constant is $8 \times 10^{-5} \mathrm{~N} \mathrm{mrad}^{-1}$
2 Current sensitivity is $40 \mathrm{rad} \mathrm{A}^{-1}$
3 Torsional constant is $3 \times 10^{-3} \mathrm{nmrad}^{-1}$
4 Current sensitivity is $40 \mathrm{deg} \mathrm{A}^{-1}$
Magnetism and Matter

154209 Two galvanometers ' $A$ ' and ' $B$ ' require currents of $4 \mathrm{~mA}$ and $7 \mathrm{~mA}$, respectively to produce the same deflection of 20 divisions. If ' $S_{A}$ ' and ' $S_{B}$ ' are their sensitivities, respectively, then

1 $\mathrm{S}_{\mathrm{A}}=\mathrm{S}_{\mathrm{B}}=\frac{4}{7}$
2 $\mathrm{S}_{\mathrm{A}} \lt \mathrm{S}_{\mathrm{B}}$
3 $\mathrm{S}_{\mathrm{B}}=\frac{7}{4} \mathrm{~S}_{\mathrm{A}}$
4 $\mathrm{S}_{\mathrm{A}}>\mathrm{S}_{\mathrm{B}}$