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Magnetic Effect of Electric Current Class 10 MCQ. We covered all the Magnetic Effect of Electric Current Class 10 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 Class 10th Class
A negatively charged particle is moving along the y-axis and enters a magnetic field directed along the x-axis. What path will the particle follow?
(A) straight line along the y-axis
(B) circular path in the xz-plane
(C) circular path in the yz-plane
(D) circular path in the xy-plane
Option c – circular path in the yz-plane
Based on Biot-Savart’s law, the magnetic field strength at a specific point due to a current-carrying wire depends on:
(A) the amount of current flowing
(B) a small segment of the conductor
(C) the sine of the angle between the element and the line connecting the point to it
(D) all the above factors
Option d – all the above factors
In the functioning of a cyclotron:
(A) both electric and magnetic fields are present throughout the device
(B) magnetic field exists only in the gap between the dees
(C) electric field is confined to the region between the dees
(D) both fields are limited to the gap between the dees
Option c – electric field is confined to the region between the dees
What is the direction of the magnetic field created at a point due to a very long straight current-carrying wire?
(A) along the line connecting the point to the wire
(B) perpendicular to the plane formed by the wire and the point
(C) in the same direction as the current
(D) opposite to the direction of current
Option b – perpendicular to the plane formed by the wire and the point
In a cyclotron, the magnetic field applied is responsible for:
(A) increasing the particle’s speed only
(B) altering the direction of the particle only
(C) both increasing speed and changing direction
(D) not affecting either speed or direction
Option b – altering the direction of the particle only
If electric charges cease to move, the magnetic field associated with them:
(A) slowly fades to zero
(B) stays unchanged in a vacuum
(C) disappears almost immediately
(D) becomes zero after a fixed time interval
Option c – disappears almost immediately
Assertion: The magnetic field caused by a moving charge depends on relative motion.
Reason: Motion is identified through a varying position vector.
(A) Both assertion and reason are true; the reason explains the assertion
(B) Both are true; the reason does not explain the assertion
(C) Assertion is correct; reason is incorrect
(D) Assertion is incorrect; reason is correct
Option b – Both are true; the reason does not explain the assertion
If the magnetic field at a point due to a current-carrying wire is found to be zero, what can be inferred?
(A) the point lies on the conductor
(B) the point lies perpendicularly to the wire
(C) the angle between the point and element is 45°
(D) the given information is not enough to determine
Option d – the given information is not enough to determine
The magnetic field at a point due to a wire element can be increased by increasing the current in the wire without altering any other parameters. Which statement is valid?
(A) only the first statement is true
(B) only the second statement is true
(C) both statements are true
(D) neither statement is true
Option c – both statements are true
A charged particle moving in a constant magnetic field loses 80% of its momentum after a collision. What happens to the radius of its circular trajectory?
(A) becomes 20% of the original radius
(B) reduces by 20% of the initial radius
(C) reduces by 40% of the initial radius
(D) becomes 40% of the initial radius
Option a – becomes 20% of the original radius
When different wires of the same length and material but varying cross-sectional areas carry the same current, the linear graph of magnetic field induction (B) will be plotted against:
(A) area of cross-section
(B) current density
(C) reciprocal of the wire’s volume element
(D) wire radius
Option b – current density
In a cyclotron, a positively charged particle is accelerated by an oscillating ………. field and crosses it repeatedly under the influence of a strong ………. field.
(A) electromagnetic, magnetic
(B) magnetic, electric
(C) magnetic, electromagnetic
(D) electric, magnetic
Option d – electric, magnetic
Select the correct statement(s):
(i) Magnetic field lines form concentric circles around a straight current-carrying wire with the wire as the axis.
(ii) Around a circular coil, magnetic field lines also form concentric circles, centered along a line perpendicular to the coil.
(A) only (i)
(B) only (ii)
(C) both (i) and (ii)
(D) neither (i) nor (ii)
Option a – only (i)
Assertion: All charged particles moving in a uniform magnetic field perpendicular to their motion possess the same energy.
Reason: The speed of the particle remains unaffected.
(A) Both assertion and reason are true; the reason explains the assertion
(B) Both are true; the reason does not explain the assertion
(C) Assertion is correct; reason is incorrect
(D) Assertion is incorrect; reason is correct
Option a – Both assertion and reason are true; the reason explains the assertion
A charged particle (q) moving in a uniform magnetic field (B) experiences a force due to:
(A) its own charge
(B) the magnetic field applied
(C) the particle’s motion
(D) the interaction between the particle’s field and the external magnetic field
Option d – the interaction between the particle’s field and the external magnetic field
Assertion: In electronic circuits, wires are often twisted together.
Reason: In twisted wires, charges spiral as they move.
(A) Both assertion and reason are true; the reason explains the assertion
(B) Both are true; the reason does not explain the assertion
(C) Assertion is correct; reason is incorrect
(D) Both assertion and reason are incorrect
Option d – Both assertion and reason are incorrect
Assertion: A graph plotting magnetic induction (B) versus distance (x) along the axis of a circular current-carrying coil is symmetric about the Y-axis.
Reason: The direction of current is consistent along the coil’s circular path.
(A) Both assertion and reason are true; the reason explains the assertion
(B) Both are true; the reason does not explain the assertion
(C) Assertion is correct; reason is incorrect
(D) Assertion is incorrect; reason is correct
Option a – Both assertion and reason are true; the reason explains the assertion
According to Oersted’s experiment, the magnetic field on either side of a current-carrying wire is:
(A) same and increases
(B) remains constant
(C) opposite in direction
(D) same and decreases
Option c – opposite in direction
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