Magnetic Effect of Electric Current MCQ. We covered all the Magnetic Effect of Electric Current MCQ in this post for free so that you can practice well for the exam.
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MCQ on Magnetic Effect of Electric Current for NEET Students
A suspension wire of phosphor bronze alloy is preferred in MCG because (i) its restoring torque per unit twist is large. (ii) its tensile strength is large.
(A) only (i).
(B) only (ii).
(C) neither (i) nor (ii).
(D) (i) and (ii).
Option b – only (ii).
A linear current-carrying conductor is placed along the axis of a current-carrying circular coil perpendicular to the plane of the coil, then
(A) only the straight conductor experiences force.
(B) only the coil experiences force.
(C) both experience force.
(D) none experiences force.
Option d – none experiences force.
Choose an incorrect statement to increase the voltage and current sensitivity of a galvanometer
(A) a number of turns should be increased.
(B) area of the coil should be increased.
(C) resistance of the galvanometer should be decreased.
(D) the torsional constant of the suspension wire should be reduced.
Option c – resistance of the galvanometer should be decreased.
When a magnetic needle is kept in a non-uniform magnetic field it experiences
(A) a force but not a torque.
(B) a torque but not a force.
(C) a force and torque.
(D) neither force nor torque.
Option c – a force and torque.
A current-carrying conductor experiences force F when placed perpendicular to the direction of the magnetic field. How can this force be reduced to half?
(A) By inclining the conductor through 60° with the direction of the field.
(B) By inclining the conductor through 30° with the direction of the field.
(C) By aligning the conductor in the direction of the field.
(D) By aligning the conductor in a direction opposite to that of the field.
Option b – By inclining the conductor through 30° with the direction of the field.
An irregularly shaped flexible wire carrying current when placed in the external magnetic field becomes
(A) linear.
(B) circular.
(C) rectangular.
(D) square in shape.
Option b – circular.
The amount of current that produces one scale deflection in the galvanometer is called
(A) the figure of merit.
(B) current sensitivity.
(C) voltage sensitivity.
(D) galvanometer constant.
Option a – the figure of merit.
A rectangular coil of length 0.12 m and width 0.1 m having 100 turns of wire is suspended vertically in a uniform magnetic field of strength 0.4 Wb/m². The coil carries a current of 1 A. If the plane of the coil is inclined at an angle of 60° with the direction of the field, the torque required to keep the coil in stable equilibrium will be
(A) 0.12 Nm
(B) 0.15 Nm
(C) 0.20 Nm
(D) 0.24 Nm
Option d – 0.24 Nm
Two beams of slow-moving electrons traveling in the same direction, unlike two parallel wires carrying current in the same direction, repel each other. This indicates
(A) the absence of magnetic interaction.
(B) absence of electrostatic interaction.
(C) the dominance of magnetic interaction.
(D) the dominance of electrostatic interaction.
Option d – the dominance of electrostatic interaction.
If the current sensitivity of the galvanometer increases but the resistance of the circuit is unchanged then its voltage sensitivity
(A) increases.
(B) decreases.
(C) remains unchanged.
(D) becomes time-dependent.
Option a – increases.
For the coil to be in equilibrium, the angle between area element A and magnetic field B should be
(A) 0°
(B) 90°
(C) 0° or 180°
(D) 180°
Option c – 0° or 180°
A linear wire carrying current 0.1 A stays suspended horizontally in the air in a region of the uniform magnetic field of 0.5 T. The linear density of the wire is
(A) 1 kg/m
(B) 5.1 g/m
(C) 9.8 kg/m
(D) 9.8 g/m
Option b – 5.1 g/m
If the coil, having a cross-section area of 0.25 m² and carrying a current of 4 A is placed in a uniform field of 0.5 T with the normal to the coil making an angle of 45° with the direction of the field, then the torque experienced by the coil will be
(A) 0.028 N-m
(B) 0.138 N-m
(C) 0.24 N-m
(D) 0.35 N-m
Option d – 0.35 N-m
To increase the current sensitivity of a moving coil galvanometer by 30% its resistance is increased so that the new resistance becomes twice its initial resistance. By what factor does its voltage sensitivity change?
(A) Increases by 30%
(B) Decreases by 30%
(C) Decreases by 35%
(D) Increases by 50%
Option c – Decreases by 35%
A current-carrying circular loop lies on a smooth horizontal plane. If the loop needs to be turned about the vertical axis, a uniform magnetic field should be set up
(A) parallel to the plane of the loop.
(B) perpendicular to the plane of the loop.
(C) making 45° with the axis passing through the center of the loop and perpendicular to the plane of the loop.
(D) none of the above.
Option d – none of the above.
A moving coil galvanometer is very sensitive and gives at once large deflection. To control its speed of deflection
(A) a magnet should be placed near the coil.
(B) high resistance is to be connected across its terminals.
(C) a small copper wire should be connected across its terminals.
(D) the body of the galvanometer should be earthed.
Option a – a magnet should be placed near the coil.
Three long straight wires are connected parallel to each other across a battery of negligible internal resistance. The ratio of their resistance is 4 : 4 : 7. What is the ratio of distances of the middle wire from the others if the net force experienced by it is zero?
(A) 4 : 7
(B) 7 : 4
(C) 4 : 4
(D) 7:15
Option b – 7 : 4
A moving coil galvanometer is based on the
(A) electric effect of current.
(B) magnetic effect of current.
(C) electromagnetic effect of current.
(D) Peltier effect of current.
Option b – magnetic effect of current.
A conducting rod of length 10 cm and mass 50 g moving down a smooth inclined plane of inclination 30° with constant velocity 5 m/s. A current of 0.2 A is flowing in the conductor in a direction perpendicular to the paper inwards. If a vertically upwards magnetic field exists in space then, the magnitude of the magnetic field is Take g = 10 m/s²
(A) 8.9 T
(B) 11.6 T
(C) 13.6 T
(D) 14.4 T
Option d – 14.4 T
Assertion: Earth’s magnetic field does not affect the working of a moving coil galvanometer. Reason: A MCG is kept in a soft iron case that expels the magnetic field of the earth.
(A) The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) The assertion is True, and Reason is True; Reason is not a correct explanation for Assertion.
(C) The assertion is True, Reason is False.
(D) The assertion is False, Reason is True.
Option c – The assertion is True, Reason is False.
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