1

WB JEE 2021

MCQ (Single Correct Answer)

+1

-0.25

A thin charged rod is bent into the shape of a small circle of radius R, the charge per unit length of the rod being $$\lambda$$. The circle is rotated about its axis with a time period T and it is found the magnetic field at a distance d away (d >> R) from the centre and on the axis, varies as $$R^m \over d^n$$. The values of m and n respectively are

2

WB JEE 2021

MCQ (Single Correct Answer)

+1

-0.25

For two types of magnetic materials A and B, variation of $$1\over\chi$$ ($$\chi$$ : susceptibility) versus temperature T is shown in the figure. Then,

3

WB JEE 2020

MCQ (Single Correct Answer)

+1

-0.25

As shown in the figure, a single conducting wire is bent to form a loop in the form of a circle of radius r concentrically inside a square of side a, where a : r = 8 : $$\pi $$. A battery B drives a current through the wire. If the battery B and the gap G are of negligible sizes, determine the strength of magnetic field at the common centre O.

4

WB JEE 2020

MCQ (Single Correct Answer)

+1

-0.25

As shown in the figure, a wire is bent to form a D-shaped closed loop, carrying current I, where the curved part is a semi-circle of radius R. The loop is placed in a uniform magnetic field B, which is directed into the plane of the paper. The magnetic force felt by the closed loop is

Questions Asked from Magnetism (MCQ (Single Correct Answer))

Number in Brackets after Paper Indicates No. of Questions

WB JEE Subjects

Physics

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Units & Measurements
Vector Algebra
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Laws of Motion
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Center of Mass
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Properties of Matter
Heat and Thermodynamics
Simple Harmonic Motion
Waves
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Electricity

Optics

Modern Physics

Chemistry

Physical Chemistry

Some Basic Concepts of Chemistry
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Redox Reaction
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Chemical Equilibrium
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Thermodynamics
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Radioactivity and Nuclear Chemistry
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Solid State
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Inorganic Chemistry

Periodic Table
Chemical Bonding
Metallurgy
Hydrogen and It's Compounds
Some s Block Elements
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Organic Chemistry

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