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

If the maximum value of accelerating potential provided by a radio frequency oscillator is $12 kV$ . The number of revolution made by a proton in a cyclotron to achieve one sixth of the speed of light is:

$[m_{p} = 1.67 \times 10^{- 27} kg, e = 1.6 \times 10^{- 19} C$ , Speed of light $= 3 \times 10^{8} m s^{- 1}]$

14.29% studentsanswered this correctly

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 - 26 August 2021 Shift 2>Q 4

A coil in the shape of an equilateral triangle of side

10 cm

lies in a vertical plane between the pole pieces of permanent magnet producing a horizontal magnetic field

20 mT

. The torque acting on the coil when a current of

0.2 A

is passed through it and its plane becomes parallel to the magnetic field will be

\sqrt{x} \times 10^{- 5} Nm

. 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 - 27 August 2021 Shift 1>Q 5

Two ions of masses $4 amu$ and $16 amu$ have charges $+ 2 e$ and $+ 3 e$ respectively. These ions pass through the region of the constant perpendicular magnetic field. The kinetic energy of both ions is the same. Then:

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 27 August 2021 Shift 1>Q 6

A uniform conducting wire of length is

24 a,

and resistance

R

is wound up as a current carrying coil in the shape of an equilateral triangle of side

a

and then in the form of a square of side

a

. The coil is connected to a voltage source

V_{0} .

The ratio of magnetic moment of the coils in case of equilateral triangle to that for square is

1 : \sqrt{y}

where

y

is ____________.

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 15 - Magnetic Effects of Current and Magnetism>JEE Main - 27 August 2021 Shift 2>Q 7

A coaxial cable consists of an inner wire of radius

a

surrounded by an outer shell of inner and outer radii

b

and

c

respectively. The inner wire carries an electric current

i_{0}

which is distributed uniformly across cross-sectional area. The outer shell carries an equal current in opposite direction and distributed uniformly. What will be the ratio of the magnetic field at a distance

x

from the axis when

(i)

x < a

and

(i i)

a < x < b

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 8

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 :

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 :

If the maximum value of accelerating potential provided by a radio frequency oscillator is 12kV. The number of revolution made by a proton in a cyclotron to achieve one sixth of the speed of light is: mp=1.67×10-27 kg, e=1.6×10-19 C, Speed of light=3×108 m s-1

Important Questions on Magnetic Effects of Current and Magnetism

Learn and Prepare for any exam you want !