Select Goal &
City
Select Goal
Explore
Question:
A 15.7mW laser beam has a diameter of 4mm. If the amplitude of the associated magnetic field is expressed as \(\frac{π΄}{\sqrt{Ξ΅_0π^3}}\) , the value of A is: (π0 is the free space permittivity and π is the speed of light)
A 15.7mW laser beam has a diameter of 4mm. If the amplitude of the associated magnetic field is expressed as \(\frac{π΄}{\sqrt{Ξ΅_0π^3}}\) , the value of A is: (π0 is the free space permittivity and π is the speed of light)
Updated On: Oct 1, 2024
- 50
- 35.4
- 100
- 70.8
Hide Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
The correct option is (A): 50
Was this answer helpful?
0
0
Top Questions on Magnetism and Maxwell's Equations
- The magnitudes of spin magnetic moments of electron, proton and neutron are ΞΌe, ΞΌp and ΞΌn, respectively. Then
- IIT JAM - 2024
- Physics
- Magnetism and Maxwell's Equations
- A time dependent magnetic field inside a long solenoid of radius 0.05m is given by \(\overrightarrowπ΅\)(π‘) = π΅0 sin ππ‘ \(\^z\). If π=100rad/s and π΅0= 0.98Weber/m2 , then the amplitude of the induced electric field at a distance of 0.07m from the axis of the solenoid is ______V/m. (Rounded off to two decimal places)
- IIT JAM - 2024
- Physics
- Magnetism and Maxwell's Equations
- A small bar magnet is dropped through different hollow copper tubes with same length and inner diameter but with different outer diameter. The variation in the time (t) taken for the magnet to reach the bottom of the tube depends on its wall thickness (d) as
- IIT JAM - 2023
- Physics
- Magnetism and Maxwell's Equations
- Suppose the divergence of magnetic field \(\vec{π΅}\) is nonzero and is given as \(ββ.\vec{π΅} = \mu_0\rho_m\), where π0 is the permeability of vacuum and πm is the magnetic charge density. If the corresponding magnetic current density is \(\vec{J}_π\), then the curl \(ββ Γ \vec{πΈ}\) of the electric field \(\vec{πΈ}\) is
- IIT JAM - 2023
- Physics
- Magnetism and Maxwell's Equations
- A circular loop of wire with radius R is centered at the origin of the xy-plane. The magnetic field at a point within the loop is, \(\overrightarrow B(\rho,\phi,z,t)=k\rho^3t^3\hat{z}\), where k is a positive constant of appropriate dimensions. Neglecting the effects of any current induced in the loop, the magnitude of the induced emf in the loop at time t is
- IIT JAM - 2022
- Physics
- Magnetism and Maxwell's Equations
View More Questions
Questions Asked in IIT JAM exam
- One mole of an ideal monoatomic gas is heated in a closed container, first from 273K to 303K, and then from 303K to 373K. The net change in the entropy is ______R. (Rounded off to two decimal places) (R is the ideal gas constant)
- IIT JAM - 2024
- Modern Physics
- In a Newtonβs rings experiment (using light of free space wavelength 580nm), there is an air gap of height d between the glass plate and a plano-convex lens (see figure). The central fringe is observed to be bright.
The least possible value of d (in nm) is:- IIT JAM - 2024
- Modern Physics
- The value of the line integral for the vector,
\(\overrightarrowπ£=2π₯Μ +π¦π§ ^2π¦Μ +(3π¦+π§ ^2 )π§Μ \)
along the closed path OABO (as shown in the figure) is:
(Path AB is the arc of a circle of unit radius)- IIT JAM - 2024
- Mathematical Methods
- A vector field is expressed in the cylindrical coordinate system (s, Ο, z) as,
\(\overrightarrowπΉ=\frac{π΄}{π } π Μ+ \frac{π΅}{π } π§Μ. \)
If this field represents an electrostatic field, then the possible values of A and B, respectively, are:- IIT JAM - 2024
- Mathematical Methods
- If the electric field of an electromagnetic wave is given by,
πΈβ = (4π₯Μ + 3π¦Μ)π π(ππ‘+ππ₯β600π¦)
then the value of a is: (all values are in the SI units)- IIT JAM - 2024
- Electricity
View More Questions
SUBSCRIBE TO OUR NEWS LETTER
COLLEGE NOTIFICATIONSEXAM NOTIFICATIONSNEWS UPDATES
Download the Collegedunia app on 
Β© 2024 Collegedunia Web Pvt. Ltd. All Rights Reserved