Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : For measuring the potential difference across a resistance of 600 Ω , the voltmeter with resistance 1000 Ω will be preferred over voltmeter with resistance 4000 Ω . Reason R : Voltmeter with higher resistance will draw smaller current than voltmeter with lower resistance. In the light of the above statements, choose the most appropriate answer from the options given below

A is not correct but R is correct

Both A and R are correct and R is the correct explanation of A

Both A and R are correct but R is not the correct explanation of A

A is correct but R is not correct

MEDIUM

JEE Main

IMPORTANT

Earn 100

There are two infinitely long straight current-carrying conductors and they are held at right angles to each other so that their common ends meet at the origin as shown in the figure given below. The ratio of current in both conductors is $1 : 1$ . The magnetic field at point $P$ is $_________.$

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Important Questions on Magnetic Effects of Current and Magnetism

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 20 July 2021 Shift 1>Q 15

A deuteron and an alpha particle having equal kinetic energy enter perpendicular into a magnetic field. Let

r_{d}

and

r_{α}

be their respective radii of circular path. The value of

\frac{r_{d}}{r_{α}}

is equal to:

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 20 July 2021 Shift 2>Q 16

At an angle of

30 °

to the magnetic meridian, the apparent dip is

45 ° .

Find the true dip:

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 20 July 2021 Shift 2>Q 17

The magnetic susceptibility of a material of a rod is

499 .

Permeability in vacuum is

4 π \times 10^{- 7} {Hm}^{- 1} .

Absolute permeability of the material of the rod is

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 22 July 2021 Shift 1>Q 18

Statement I : The ferromagnetic property depends on temperature. At high temperature, ferromagnet becomes paramagnet.

Statement II : At high temperature, the domain wall area of a ferromagnetic substance increases. In the light of the above statements, choose the most appropriate answer from the options given below:

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 22 July 2021 Shift 1>Q 19

Choose the correct option.

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 25 July 2021 Shift 1>Q 20

The value of aluminium susceptibility is

2.2 \times 10^{- 5}

. The percentage increase in the magnetic field if space within a current carrying toroid is filled with aluminium is

\frac{n}{10^{4}}

. Then the value of

n

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 25 July 2021 Shift 2>Q 21

Two ions having same mass have charges in the ratio

1 : 2

. They are projected normally in a uniform magnetic field with their speeds in the ratio

2 : 3

. The ratio of the radii of their circular trajectories is,

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 27 July 2021 Shift 1>Q 22

In a uniform magnetic field, the magnetic needle has a magnetic moment

9.85 \times 10^{- 2} A m^{- 2}

and moment of inertia

5 \times 10^{- 6} kg m^{2} .

If it performs

10

complete oscillations in

5

seconds then the magnitude of the magnetic field is ____

mT

[Take

π^{2}

9.85]

There are two infinitely long straight current-carrying conductors and they are held at right angles to each other so that their common ends meet at the origin as shown in the figure given below. The ratio of current in both conductors is 1:1. The magnetic field at point P is_________.

Important Questions on Magnetic Effects of Current and Magnetism

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There are two infinitely long straight current-carrying conductors and they are held at right angles to each other so that their common ends meet at the origin as shown in the figure given below. The ratio of current in both conductors is $1 : 1$ . The magnetic field at point $P$ is $_________.$