An isosceles triangular current-carrying loop is kept perpendicularly in a uniform magnetic field as shown in the figure. The force on the loop due to magnetic field is:
1
2
3
4
Official Solution
Correct Option:
(3)
In a uniform magnetic field, the net force on any closed current loop is zero. Each segment may experience a magnetic force, but by symmetry and vector addition, the total force cancels out. In this case:
- The loop is symmetric.
- Magnetic forces on opposite sides are equal and opposite in direction.
- Thus, net magnetic force on the loop = 0. \
02
PYQ 2022
medium
physicsID: ap-eapce
A charged particle is moving in a uniform magnetic field and enters a lead layer, losing half of its kinetic energy. The radius of curvature of its path becomes:
1
No change
2
Reduced by times of its initial value
3
Reduced to times of its initial value
4
Reduce to times of its initial value
Official Solution
Correct Option:
(3)
The radius of curvature in a magnetic field is given by:
Kinetic energy:
If kinetic energy becomes half:
So, the radius decreases by a factor of .
03
PYQ 2023
medium
physicsID: ap-eapce
The magnetic force is
1
parallel to both and
2
perpendicular to
3
perpendicular to both and
4
parallel to
Official Solution
Correct Option:
(3)
The magnetic force on a charged particle moving with velocity in a magnetic field is given by:
Where:
- is the charge of the particle,
- is the velocity vector,
- is the magnetic field vector. This force is always perpendicular to both the velocity and the magnetic field . Thus, the force is perpendicular to both and , which is the correct option.
04
PYQ 2023
medium
physicsID: ap-eapce
A magnetic field of 1 T is acting on a wire carrying a current of 1 A so that the wire is at rest in air. If the mass of the wire is 100 g, then the length of the wire is:
1
1 m
2
0.5 m
3
2 m
4
0.25 m
Official Solution
Correct Option:
(1)
The force due to the magnetic field on the wire is: The weight of the wire is: For the wire to be at rest, the magnetic force must balance the weight of the wire: Substitute the values: Solving for : Thus, the length of the wire is approximately 1 m.
05
PYQ 2023
medium
physicsID: ap-eapce
An electron moving along positive x-direction with velocity ms enters a magnetic field of T. The magnitude of the force acting on the electron is:
1
2
3
4
Official Solution
Correct Option:
(2)
The force on a charged particle moving in a magnetic field is given by the equation . Using the given values for velocity and magnetic field , we calculate the cross product and find the magnitude of the force acting on the electron as .
About Magnetic Force - AP-EAPCET
Magnetic Force is a vital chapter for AP-EAPCET aspirants. Mastering the concepts covered in this chapter is essential for securing a top rank.
By rigorously practicing the previous year questions associated with this chapter, you can identify high-yield topics, understand the examiner's perspective, and boost your confidence during the actual exam.
Frequently Asked Questions
Why focus on Magnetic Force PYQs?
Analyzing PYQs for this specific chapter reveals the most frequently tested concepts and the typical complexity of questions, allowing you to tailor your study plan efficiently.
How to best use this analysis?
Review the topic breakdown to see which sub-topics within Magnetic Force carry the most weight. Then, tackle the questions iteratively to solidify your understanding.
