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The chapter magnetic effects of electric current deals with the magnetic field produced by the current-carrying wire and moving charges and also magnetic force acting on a current-carrying wire. In magnetism, properties of a magnetic dipole, earth’s magnetism and different magnetic material are discussed. From JEE's point of view, students can score good marks in these chapters with proper practice and effort.

In magnetic effects of current, problems based on moving charges in a magnetic field and their applications are important. The magnetic field of various current-carrying conductors of various shapes and solenoids are derived using Biot Savart law and Ampere’s law. The force acting on a current-carrying conductor in a magnetic field is also important. Here, we will see many magnetic effects of electric current examples.

In the section on magnetism, earth’s magnetism and magnetic materials are very important and problems based on a magnetic bar placed in an external magnetic field are also discussed in detail. Also, new terms related to the magnetisation of material are also discussed along with the hysteresis curve.

Now, let us move on to the important concepts and formulae related to JEE and JEE Main exams from magnetic effects of current and magnetism along with a few solved magnetic effects of electric current examples.

Magnetic force on a moving charge in a magnetic field

Trajectory of a charge moving in a perpendicular magnetic field

Cyclotron

Biot Savart Law

Ampere’s Law

Magnetic field due to a circular and straight wire

Magnetic field due to a solenoid

Force on a current-carrying conductor in a magnetic field.

The force between two parallel current-carrying conductors

Magnetic dipole moment of a magnet

Terms related to magnetism

Elements of Earth’s Magnetic Field

Magnetic Materials

Curie’s Law

Hysteresis curve

A current of 10 A is flowing in a wire of a length of 1.5 m. A force of 15 N acts on it when it is placed in a uniform magnetic field of 2 T. The angle between the direction of the current and magnetic field is…

Sol:

Given,

Uniform magnetic field, B = 2T

Current passing through the wire, I = 10 A

Length of wire, L = 1.5 m

The force acting on the wire placed in the magnetic field, F = 15 N

The formula to calculate the magnetic force acting on the wire is given by,

$F=ILB\sin\theta$

Substitute values for each term in the formula to calculate the angle between the magnetic field and direction of the current.

$15=10\times 1.5\times 2\sin\theta$

$\sin\theta=\dfrac{1}{2}$

$\theta=\sin^{-1}(0.5)$

$\theta=30^{0}$

Therefore, the angle between the direction of the current and magnetic field is 30o.

Key Point: A current-carrying placed in a magnetic field experience a force.

If the angle of dip at two places are 300 and 450 respectively, then the ratio of horizontal components of earth’s magnetic field at two places will be

Sol:

Given,

The angle of dip of two places are θ1= 300 and θ2=450

The horizontal component of earth’s magnetic field where θ1= 300 is given by,

$B_{H1}=B\cos\theta_1$

$B_{H1}=B\cos(30^0)$

$B_{H1}=\dfrac{\sqrt{3}B}{2}$...(1)

Similarly, the horizontal component of earth’s magnetic field where θ1= 450 is given by,

$B_{H2}=B\cos\theta_2$

$B_{H2}=B\cos(45^0)$

$B_{H2}=\dfrac{B}{\sqrt{2}}$....(2)

Divide equation (1) by equation (2) to obtain the ratio of horizontal component of earth’s magnetic field.

$\dfrac{B_{H1}}{B_{H2}}=\dfrac{\left(\dfrac{\sqrt{3}B}{2}\right)}{\left(\dfrac{B}{\sqrt{2}}\right)}$

$\dfrac{B_{H1}}{B_{H2}}=\dfrac{\sqrt{3}}{\sqrt{2}}$

Therefore, the ratio of horizontal components of earth’s magnetic field at two places is $\dfrac{\sqrt{3}}{\sqrt{2}}$.

Key point: The horizontal component of earth’s magnetic field and dip angle is related by the formula.

A proton, a deuteron and an α particle are moving with the same momentum in a uniform magnetic field. The ratio of magnetic forces acting on them is _______ and their speeds are in the ratio______.(JEE 2021)

a. 2 : 1 : 1 and 4 : 2 : 1

b. 1 : 2 : 4 and 2 : 1 :1

c. 1 : 2 : 4 and 1 : 1 : 2

d. 4 : 2 : 1 and 2 : 1 : 1

Sol:

We know velocity(v) of a body is related to its momentum by the formula

$v=\dfrac{P}{m}$

The magnetic force acting on a charged particle is given by the formula,

Let the mass of a proton, duetron and α particle be m, 2m and 4m respectively.

Let the charge of a proton, duetron and α particle be q, 2q and 4q respectively.

Force acting on proton in a magnetic field B is given by,

$F_1=qvB$

$F_1=q\left(\dfrac{P}{m}\right)B$

Force acting on duetron in a magnetic field B is given by,

$F_2=qvB$

$F_2=q\left(\dfrac{P}{2m}\right)B$

Force acting on α particle in a magnetic field B is given by,

$F_3=2qvB$

$F_3=2q\left(\dfrac{P}{4m}\right)B$

$F_3=q\left(\dfrac{P}{2m}\right)B$

The ratio of magnetic forces on the charged particles are,

$F_1:F_2:F_3=q\left(\dfrac{P}{m}\right)B:q\left(\dfrac{P}{2m}\right)B:q\left(\dfrac{P}{2m}\right)B$

$F_1:F_2:F_3=2:1:1$

The ratio of velocities of charge particles are,

$v_1:v_2:v_3=\left(\dfrac{P}{m}\right):\left(\dfrac{P}{2m}\right):\left(\dfrac{P}{4m}\right)$

$v_1:v_2:v_3=4:2:1$

Therefore, correct option is option (a)

Key Point: Knowing the charge and mass of proton, duetron and alpha particle is important in order to solve the above problem.

The figure gives experimentally measured B vs H variation in a ferromagnetic material. The retentivity, coercivity and saturation, respectively, of the material, are(JEE Main 2021)

a. 1.5 T, 50 A/m, 1 T

b. 1 T, 50 A/m, 1.5 T

c. 1.5 T, 50 A/m, 1 T

d. 150 A/m, 1 T, 1.5 T

Sol:

Retentivity is the ability of an object to retain magnetism even after the magnetising field is removed. It is denoted by the value of X = 1T

Coercivity is the opposing magnetising field required to demagnetise the material and it is denoted by the value of Y = 50 A/m

Saturation is the value of magnetic field density in the B-H curve denoted by the value of Z = 1.5 T

A magnet is parallel to a uniform magnetic field. If it is rotated by 60o, the work done is 0.8 J. How much work is done in moving 30o further? (Ans: 0.8 J)

A charged particle (charge q) is moving in a circle of radius R with a uniform speed v. The associated magnetic moment is given by μ (Ans: qvR/2)

In this article we have provided important information regarding the chapter magnetic effects of electric current and magnetism such as important concepts, formulae, etc.. Students should work on more solved examples along with previous year question papers for scoring good grades in the JEE exams.

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28th July 2022 - Maths, Physics and Chemistry

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June, July

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mathematics

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mathematics

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mathematics

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chemistry

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In order to prepare for JEE Main 2022, candidates should know the list of important books i.e. RD Sharma Solutions, NCERT Solutions, RS Aggarwal Solutions, HC Verma books and RS Aggarwal Solutions. They will find the high quality readymade solutions of these books on Vedantu. These books will help them in order to prepare well for the JEE Main 2022 exam so that they can grab the top rank in the all India entrance exam.

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JEE Main 2022 free online mock test series for exam preparation are available on the Vedantu website for free download. Practising these mock test papers of Physics, Chemistry and Maths prepared by expert teachers at Vedantu will help you to boost your confidence to face the JEE Main 2022 examination without any worries. The JEE Main test series for Physics, Chemistry and Maths that is based on the latest syllabus of JEE Main and also the Previous Year Question Papers.

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NTA is responsible for the release of the JEE Main 2022 June and July Session cut off score. The qualifying percentile score might remain the same for different categories. According to the latest trends, the expected cut off mark for JEE Main 2022 June and July Session is 50% for general category candidates, 45% for physically challenged candidates, and 40% for candidates from reserved categories. For the general category, JEE Main qualifying marks for 2021 ranged from 87.8992241 for general-category, while for OBC/SC/ST categories, they ranged from 68.0234447 for OBC, 46.8825338 for SC and 34.6728999 for ST category.

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JEE Main 2022 June and July Session Result - NTA has announced JEE Main result on their website. To download the Scorecard for JEE Main 2022 June and July Session, visit the official website of JEE Main NTA.

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Rank List

Counselling

Cutoff

JEE Main 2022 state rank lists will be released by the state counselling committees for admissions to the 85% state quota and to all seats in NITs and CFTIs colleges. JEE Main 2022 state rank lists are based on the marks obtained in entrance exams. Candidates can check the JEE Main 2022 state rank list on the official website or on our site.

Want to know which Engineering colleges in India accept the JEE Main 2022 scores for admission to Engineering? Find the list of Engineering colleges accepting JEE Main scores in India, compiled by Vedantu. There are 1622 Colleges that are accepting JEE Main. Also find more details on Fees, Ranking, Admission, and Placement.

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FAQ

1. What is the weightage of the laws of motion in JEE?

Nearly 1-2 questions are asked in the exam from this chapter covering about 10 marks.

2. What is the difficulty level of the chapter on magnetic effects of current and magnetism?

Students can easily answer the questions coming from the magnetism section if they have gone through the concepts thoroughly. However, the questions from magnetic effects of current requires knowledge and problem solving skills to score good marks.

3. Are previous year's questions Important for JEE Main?

Yes, previous year's JEE Main questions are important. Once the student is finished with learning concepts and solving problems, they must go through the previous year's question papers of the last 20 years to understand the test pattern and frequent questions asked in the exam.

Vedantu offers free live Master Classes for CBSE Class 6 to 12, ICSE, JEE Main, JEE 2022, & more by India’s best teachers. Learn all the important concepts concisely along with amazing tricks to score high marks in your class and other competitive exams.

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