The magnetic field at the point of intersection of diagonals of a square wire loop of side carrying a current is
1
2
3
4
Official Solution
Correct Option:
(4)
We can have the figure as follows
The net magnetic field at the point of intersection of the diagonal would be given by
Aliter
02
PYQ 2014
easy
physicsID: wbjee-20
A long conducting wire carrying a current is bent at (see figure). The magnetic field at a point on the right bisector of bending angle at a distance d from the bend is is the permeability of free space)
1
2
3
4
Official Solution
Correct Option:
(4)
We know that
03
PYQ 2015
medium
physicsID: wbjee-20
Two particles, and , having equal charges, after being accelerated through the same potential difference enter into a region of uniform magnetic field and the particles describe circular paths of radii and , respectively. The ratio of the masses of and is
1
2
3
4
Official Solution
Correct Option:
(3)
Radius of circular path followed by charged particle is given by
where, is kinetic energy of particle. Charged particle is accelerated through some potential difference , such that kinetic energy of particle is
As the two charged particles of same magnitude and being accelerated through same potential, enters into a uniform magnetic field region, then So,
04
PYQ 2016
medium
physicsID: wbjee-20
A particle of mass ????and carrying a charge ????enters with a velocity ????perpendicular to a uniform magnetic field. The time period of rotation of the particle
1
Decreases with increase of velocity v
2
Increases with increase of radius of the orbit
3
Depends only on magnetic field
4
Depends on magnetic field and (q/m) of the particle
Official Solution
Correct Option:
(4)
05
PYQ 2016
medium
physicsID: wbjee-20
The magnetic field intensity at the centre of cubical cage of identical wires of length ?a? due to a current I flowing as shown in the fiigure is
1
2
3
0
4
I/2a
Official Solution
Correct Option:
(3)
For symmetrical current distribution, magnetic field at the centre due to all current carrying conductors will get cancelled. Hence
06
PYQ 2017
medium
physicsID: wbjee-20
The magnetic field due to a current in a straight wire segment of length at a point on its perpendicular bisector at a distance
1
decreases as
2
decreases as
3
decreases as
4
approaches a finite limit as
Official Solution
Correct Option:
(2)
By Biot-Savart's law, the magnetic field due to a current carrying wire is
So, So, the magnetic field due to current decreases as inverse square of distance of the point of observation.
07
PYQ 2023
hard
physicsID: wbjee-20
A charged particle in a uniform magnetic field starts moving from the origin with velocity m/s.The trajectory of the particle and the time at which it reaches 2m above the x-y plane are
1
Helical path, sec.
2
Circular path, sec.
3
Circular path, sec.
4
Helical path, sec.
Official Solution
Correct Option:
(1)
Given: Magnetic field: Initial velocity: m/s
Explanation: The velocity has two components: - Perpendicular to : → causes circular motion in the x-y plane - Parallel to : → causes linear motion along the z-axis
Therefore, the trajectory is a helical path.
To find the time when the particle is 2 m above the x-y plane: Vertical velocity: m/s Displacement in z-direction: m Using : sec
Final Answer: Helical path, sec Correct option: (B)
About Magnetic Field - WBJEE
Magnetic Field is a vital chapter for WBJEE 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 Field 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 Field carry the most weight. Then, tackle the questions iteratively to solidify your understanding.
