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

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JEE Main

IMPORTANT

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A coil having $N$ turns is wound tightly in the form of a spiral with inner and outer radii $a$ and $b$ respectively. Find the magnetic field at centre, when a current $I$ passes through coil :

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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 - 31 August 2021 Shift 1>Q 9

Consider a galvanometer shunted with

5 Ω

resistance and

2 %

of current passes through it. What is the resistance of the given galvanometer?

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 31 August 2021 Shift 2>Q 10

A current of

1.5 A

is flowing through a triangle, of side

9 cm

each. The magnetic field at the centroid of the triangle is :
(Assume that the current is flowing in the clockwise direction.)

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 31 August 2021 Shift 2>Q 11

The magnetic field vector of an electromagnetic wave is given by

B = B_{0} \frac{\hat{i} + \hat{j}}{\sqrt{2}} \cos (k z - ω t)

where

\hat{i}, \hat{j}

represents unit vector along

x

and

y

-axis respectively. At

t = 0 s,

two electric charges

q_{1}

4 π

coulomb and

q_{2}

2 π

coulomb located at

(0, 0, \frac{π}{k})

and

(0, 0, \frac{3 π}{k}),

respectively, have the same velocity of

0.5 c \hat{i},

(where

c

is the velocity of light ). The ratio of the force acting on charge

q_{1}

q_{2}

is :

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 31 August 2021 Shift 2>Q 12

A long solenoid with

1000 turns m^{- 1}

has a core material with relative permeability

500

and volume

10^{3} {cm}^{3} .

If the core material is replaced by another material having relative permeability of

750

with same volume maintaining same current of

0.75 A

in the solenoid, the fractional change in the magnetic moment of the core would be approximately

(\frac{x}{499}) .

Find the value of

x .

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 1 September 2021 Shift 2>Q 13

Following plots show Magnetization $(M)$ vs Magnetising field $(H)$ and Magnetic susceptibility $(χ)$ vs Temperature $(T)$ graph :

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Which of the following combination will be represented by a diamagnetic material?

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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 1 September 2021 Shift 2>Q 14

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 $_________.$

Question Image

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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:

A coil having N turns is wound tightly in the form of a spiral with inner and outer radii a and b respectively. Find the magnetic field at centre, when a current I passes through coil :

Important Questions on Magnetic Effects of Current and Magnetism

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A coil having $N$ turns is wound tightly in the form of a spiral with inner and outer radii $a$ and $b$ respectively. Find the magnetic field at centre, when a current $I$ passes through coil :