Infrared radiations are detected by (a) spectrometer (b) pyrometer (c) nanometre (d) photometer

is flowing and in another coil

If in a circular coil

A

of radius

R

, current

I

B

of radius

2 R

a current

2 I

is flowing, then the ratio of the magnetic fields,

B_{A}

and

B_{B}

produced by them will be
(a) 1
(b) 2
(c)

\frac{1}{2}

(d) 4

Topic:

Moving Charges and Magnetism

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2002

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A conducting square loop of side

L

and resistance

R

moves in its plane with a uniform velocity

v

perpendicular to one of its sides. A magnetic induction

B

constant in time and space, pointing perpendicular and into the plane at the loop exists everywhere with half the loop outside the field, as shown in figure. The induced emf is

zero
$R v B$
$\frac{v B L}{R}$
$v B L$

Topic:

Electromagnetic Induction

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2002

View 4 solutions

By increasing the temperature, the specific resistance of a conductor and a semiconductor
(a) increases for both
(b) decreases for both
(c) increases, decreases respectively
(d) decreases, increases respectively

Topic:

Semiconductor Electronics: Materials, Devices and Simple Circuits

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2002

View 2 solutions

The inductance between A and D is

$3.66 H$
$9 H$
$0.66 H$
$1 H$

Topic:

Alternating Current

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2002

View 4 solutions

Practice questions from Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Which of the following are not electromagnetic waves?
(a) cosmic rays
(b)

γ

-rays
(c)

β

-rays
(d) X-rays

Topic:

Electromagnetic Waves

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2002

View 2 solutions

An electron beam is accelerated by a potential difference

V

to hit a metallic target to produce X-rays. It produces continuous as well as characteristic X-rays. If

λ_{min}

is the smallest possible wavelength of

X

-rays in the spectrum, the variation of

lo g λ_{m i n}

with

lo g V

is correctly represented in

Topic:

Electromagnetic Waves

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2017

View 4 solutions

Which of the following radiations has the least wavelength?
(a)

γ

-rays
(b)

β

-rays
(c)

α

-rays
(d) X-rays

Topic:

Electromagnetic Waves

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2003

View 2 solutions

Match List I (Electromagnetic wave type) with List II (Its association/application) and select the correct option from the choices given below the lists.

Codes:

A B C D

4 3 2 1
1 2 4 3
3 2 1 4
1 2 3 4

Topic:

Electromagnetic Waves

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2014

View solution

Practice questions from Electromagnetic Waves in the same exam

A source of light is placed in front of a screen. Intensity of light on the screen is I. Two Polaroids

Hard

P_{1}

and

P_{2}

are so placed in between the source of light and screen that the intensity of light on screen is

1/2. P_{2}

should be rotated by an angle of (degrees) so that the intensity of light on the screen becomes 3I/8..

Topic:

Electromagnetic Waves

Exam:

JEE Mains 2021 Aug 26 Shift 2

View 2 solutions

A plane electromagnetic wave propagating along y-direction can have the following pair of electric field

(E)

and magnetic field (

B

) components.

$E_{y}, B_{x}$ or $E_{x}, B_{y}$
$E_{x}, B_{z}$ or $E_{z}, B_{x}$
$E_{x}, B_{y}$ or $E_{y}, B_{x}$
$E_{y}, B_{y}$ or $E_{z}, B_{z}$

Topic:

Electromagnetic Waves

Exam:

JEE Mains 2021 Mar 18 Shift 2

View solution

Practice more questions from Electromagnetic Waves

are the absolute permeability and permitivity respectively, of space,

μ_{0}, ε_{0}

μ_{r}, ε_{r}

are the relative permeability and permittivity respectively of mediums and

μ, ε

are the absolute permeability and permittivity of medium respectively, then the refractive index of the medium is

$\frac{μ ε}{μ _{0} ε _{0}}$
$\frac{μ _{r} ε _{r}}{μ _{0} ε _{0}}$
$μ_{r} ε_{r}$
$\frac{μ ε}{μ _{0} ε _{r}}$

Topic:

Electromagnetic Waves

Book:

Master Resource Book in JEE Main Physics (Arihant)

View solution

The atmosphere above the height of

80 km

is called

stratosphere
troposphere
mesosphere
ionosphere

Topic:

Electromagnetic Waves

Book:

Master Resource Book in JEE Main Physics (Arihant)

View solution

A cube of edge a has its edges parallel to

x, y

and

z

-axis of rectangular coordinate system. A uniform electric field

E

is parallel to

y

-axis and a uniform magnetic field is

E

parallel to

x

-axis. The rate at which flows through each face of the cube is

$\frac{a ^{2} \cdot EB}{2 μ _{0}}$ parallel to $x - y$ plane and zero in others
$\frac{a ^{2} EB}{μ _{0}}$ parallel to $x - y$ plane and zero in others
$\frac{a ^{2} EB}{2 μ _{0}}$ from all faces
$\frac{a ^{2} EB}{2 μ _{0}}$ parallel; to $y - z$ faces and zero in others

Topic:

Electromagnetic Waves

View 2 solutions

With reference to ionospheric propagation, an electromagnetic wave with a critical frequency of

15 MHz

and incident at an angle of

4 5^{\circ}

will have MUF of

$15 MHz$
$152 MHz$
$152 MHz$
None of these

Topic:

Electromagnetic Waves

Book:

Master Resource Book in JEE Main Physics (Arihant)

View solution

Practice questions on similar concepts asked by Filo students

Predict/Calculate Consider a meterstick that oscillates back and forth about a pivot point at one of its ends. (a) Is the period of a simple pendulum of length L = 1.00 m greater than, less than, or the same as the period of the meterstick? Explain. (b) Find the length L of a simple pendulum that has a period equal to the period of the meterstick.

Topic:

Physics

View solution

(ii) In a charge-free region, electric field lines can be to be continuous curves without any breaks. (iii) Two field lines can never cross each other. the field at the point of intersection will unique direction, which is absurd.)

Topic:

Electrostats

View solution

Determine the relationship between model and prototype kinematic viscosity if both Reynolds number and Froude number are to be satisfied.[Linear scale to power

3/2

]

Topic:

Physics

View solution