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 $a : r = 8 : π$ . A battery $B$ drives a current $I$ 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 $O$ .

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Important Questions on Magnetic Effect of Current

MEDIUM

WBJEE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Magnetic Effect of Current>WBJEE 2018>Q 8

A circular loop of radius

r

of conducting wire connected with a voltage source of zero internal resistance produces a magnetic field

B

at its centre. If instead, a circular loop of radius

2 r

, made of same material, having the same cross-section is connected to the same voltage source, what will be the magnetic field at its centre?

HARD

WBJEE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Magnetic Effect of Current>WBJEE 2018>Q 9

A light charged particle is revolving in a circle of radius

r

in electrostatic attraction of a static heavy particle with opposite charge. How does the magnetic field

B

at the centre of the circle due to the moving charge depend on

r

?

MEDIUM

WBJEE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Magnetic Effect of Current>WBJEE 2019>Q 10

A current $I$ is flowing along an infinite, straight wire, in the positive $Z -$ direction and the same current is flowing along a similar parallel wire $5 m$ apart, in the negative $Z -$ direction. A point $P$ is at a perpendicular distance $3 m$ from the first wire and $4 m$ from the second. What will be the magnitude of the magnetic field $B$ of $P$ ?