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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 phosphor bronze wire is used in a moving coil galvanometer because
(i) it provides high restoring torque per unit twist
(ii) it possesses high tensile strength
(A) only (i)
(B) only (ii)
(C) neither (i) nor (ii)
(D) both (i) and (ii)
Option b – only (ii)
A straight current-carrying wire is positioned along the axis of a circular current-carrying coil, which lies perpendicular to the wire. In this arrangement
(A) only the straight wire is subjected to a force
(B) only the coil is affected by a force
(C) both experience force
(D) neither experiences any force
Option d – neither experiences any force
Select the incorrect method to improve the voltage and current sensitivity of a galvanometer
(A) increase the number of coil turns
(B) increase the coil’s area
(C) reduce the resistance of the galvanometer
(D) lower the torsional constant of the suspension wire
Option c – reduce the resistance of the galvanometer
When a magnetic needle is placed in a region with a non-uniform magnetic field, it will experience
(A) a force but not a torque
(B) a torque but not a force
(C) both a force and a torque
(D) neither a force nor a torque
Option c – both a force and a torque
A current-carrying conductor placed perpendicular to a magnetic field experiences a force F. To reduce this force to half, one must
(A) incline the conductor at 60° to the magnetic field
(B) incline the conductor at 30° to the magnetic field
(C) align the conductor with the magnetic field
(D) align the conductor opposite to the magnetic field
Option b – incline the conductor at 30° to the magnetic field
When a flexible wire carrying current is placed in an external magnetic field, it tends to become
(A) linear
(B) circular
(C) rectangular
(D) square
Option b – circular
The current required to produce one scale division in a galvanometer is referred to as
(A) figure of merit
(B) current sensitivity
(C) voltage sensitivity
(D) galvanometer constant
Option a – figure of merit
A rectangular coil measuring 0.12 m by 0.1 m with 100 turns is suspended vertically in a uniform magnetic field of 0.4 Wb/m² and carries 1 A of current. If the coil’s plane is inclined at 60° to the field, the torque needed for equilibrium is
(A) 0.12 Nm
(B) 0.15 Nm
(C) 0.20 Nm
(D) 0.24 Nm
Option d – 0.24 Nm
Unlike parallel current-carrying wires, two slow-moving electron beams traveling in the same direction repel each other due to
(A) no magnetic interaction
(B) no electrostatic interaction
(C) magnetic interaction being dominant
(D) electrostatic interaction being dominant
Option d – electrostatic interaction being dominant
When the current sensitivity of a galvanometer increases while the total resistance remains constant, the voltage sensitivity
(A) increases
(B) decreases
(C) stays the same
(D) becomes time-dependent
Option a – increases
For a coil to remain in equilibrium in a magnetic field, the angle between the area vector and magnetic field should be
(A) 0°
(B) 90°
(C) 0° or 180°
(D) 180°
Option c – 0° or 180°
A straight wire carrying 0.1 A remains suspended in air under the influence of a magnetic field of 0.5 T. If the linear mass 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
A coil with an area of 0.25 m² carries 4 A and is placed in a uniform magnetic field of 0.5 T. If the normal to the coil makes a 45° angle with the field, the torque acting on the coil is
(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
A galvanometer’s current sensitivity increases by 30% when its resistance is doubled. How does this affect its voltage sensitivity?
(A) Increases by 30%
(B) Decreases by 30%
(C) Decreases by 35%
(D) Increases by 50%
Option c – Decreases by 35%
To rotate a current-carrying circular loop placed flat on a horizontal surface about its vertical axis, a uniform magnetic field should be applied
(A) along the plane of the loop
(B) perpendicular to the plane of the loop
(C) at 45° to the vertical axis through the loop’s center
(D) none of these
Option d – none of these
A highly sensitive moving coil galvanometer responds with large deflection. To control the rate of its deflection
(A) place a magnet near the coil
(B) connect a high resistance across its terminals
(C) attach a small copper wire across its terminals
(D) ground the galvanometer’s body
Option a – place a magnet near the coil
Three long straight wires are connected in parallel across a battery with negligible internal resistance. Their resistance ratio is 4 : 4 : 7. What should be the ratio of the middle wire’s distance from the others to ensure no net force on it?
(A) 4 : 7
(B) 7 : 4
(C) 4 : 4
(D) 7 : 15
Option b – 7 : 4
The working principle of a moving coil galvanometer is based on
(A) electric effect of current
(B) magnetic effect of current
(C) electromagnetic effect of current
(D) Peltier effect
Option b – magnetic effect of current
A conducting rod 10 cm long and weighing 50 g slides down a smooth inclined plane at 30° with a steady speed of 5 m/s. A 0.2 A current flows perpendicular into the page. Assuming a uniform upward magnetic field, calculate its strength (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: The Earth’s magnetic field does not affect the performance of a moving coil galvanometer.
Reason: The galvanometer is housed in a soft iron case that shields it from external magnetic fields.
(A) Both assertion and reason are true, and the reason explains the assertion
(B) Both are true, but the reason does not explain the assertion
(C) Assertion is true, reason is false
(D) Assertion is false, reason is true
Option c – Assertion is true, reason is false
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