 # WBJEE: Important Questions and Preparation Tips – Magnetism

In this article the engineering section of Jagranjosh brings to you chapter notes of chapter Magnetism for WBJEE Entrance Examination 2018. These notes are prepared by Subject Experts of Physics after the detailed analysis of latest syllabus and some previous year papers of WBJEE Examination. About 1-2 questions are always asked from this topic in WBJEE Examination.

Nov 14, 2017 17:36 IST WBJEE 2018: Magnetism

Magnetism is one of the most important chapters in the syllabus of WBJEE Entrance Examination 2018. About 1-2 questions are always asked from this topic in WBJEE Examination.

Find chapter notes of chapter Magnetism including important concepts, formulae and previous year solved questions for WBJEE Entrance Examination 2018. These notes will help all WBJEE aspirants to understand the difficulty level of coming WBJEE Entrance Examination.

These chapter notes consist of all important topics of Magnetism like Magnetic Force, Magnetic Field, Lorentz Force, Magnetic Force on a current carrying conductor, Biot-Savart Law, Magnetic Field on the Axis of a Circular Current Loop, Ampere's Circuital Law, The Solenoid & Toroid, Force between two Parallel Currents etc.

West Bengal Joint Entrance Examination (WBJEE) is a state level common entrance test organized by West Bengal Joint Entrance Examinations Board for admission to the Undergraduate Level Engineering and Medical Courses through a common entrance test in the State of West Bengal.

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Some previous years solved questions are given below:

Question 1:

Two particles, A and B, having equal charges, after being accelerated through the same potential difference enter a region of uniform magnetic field and the particles describe circular paths of radii R1 and R2 respectively. The ratio of the masses of A and B is Solution 1:

The radius of circular path, r is given as, Hence, the correct option is (C).

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Question 2:

A charged particle moving in a magnetic field experiences a resultant force

(A) in the direction opposite to the field

(B) in the direction of field

(C) in the direction perpendicular to both the field and its velocity

(D) None of the above

Solution 2:

We know that,

F = q (v × B)

We can see from the above equation that the direction of force is perpendicular to the direction
of both velocity and magnetic field.

Hence, the correct option is (C).

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Question 3: Solution 3: Hence, the correct option is (C).

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Question 4: Solution 4: Hence, the correct option is (D).

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