Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 4

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A current-carrying wire of certain length is bent to form an arc that subtends an angle $θ$ at the centre. Let $B$ be the magnetic field at the centre due to this wire. The correct graph between $B$ and $θ$ is

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Important Questions on Magnetic Effects of Current and Magnetism

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 5

The magnetic field at the centre ${}^{'}O^{'}$ in the given figure is

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 6

Two long parallel wires are at a distance of

4 cm

. They carry currents

I

and

3 I

in same direction. Where will the field produced by both wires be zero from current

I

?

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 7

The region surrounding a stationary electric dipole has,

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 8

Magnetic field due to a ring having

n

turns at a distance

x

on its axis is proportional to (if

a =

radius of ring),

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 9

A current

I

flows in the anticlockwise direction through a square loop of side

a

lying in the

x y

plane with its centre at the origin. The magnetic induction at the centre of the square loop is:

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 10

A small current element of length

d l

and carrying current

i

is placed at

(1, 1, 0)

and is carrying current in

+ z

direction. If the magnetic field at origin be

{\vec{B}}_{1}

and at point

(2, 2, 0)

be

{\vec{B}}_{2}

then

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 11

An arrangement with a pair of quarter circular coils of radii $r$ and $R$ with a common centre $C$ and carrying a current $I$ is shown.

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The permeability of free space is $μ_{0}$ . The magnetic field at $C$ is

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 12

Which of the following does not hold for magnetic field lines?