Which factor does NOT affect the magnitude of motional EMF in a conductor?
The resistance of the conductor
To determine which factor does NOT affect the magnitude of motional EMF in a conductor, we must first understand the formula for calculating motional EMF:
EMF = Bℓv sin(θ)
where:
- B is the magnetic field strength.
- ℓ is the length of the conductor.
- v is the speed of the conductor.
- θ is the angle between the conductor's direction of motion and the magnetic field.
Let's analyze the provided factors:
- The speed of the conductor: Since speed (v) is directly included in the formula, it does affect the magnitude of motional EMF.
- The length of the conductor: As the length (ℓ) is also part of the equation, it affects the magnitude of motional EMF.
- The resistance of the conductor: The formula for motional EMF does not involve the resistance of the conductor. Thus, resistance does not affect the magnitude of motional EMF.
- The angle between the conductor's velocity and the magnetic field: The angle (θ) affects the magnitude through the sine function. Therefore, it influences the motional EMF.
Given this analysis, the resistance of the conductor does NOT affect the magnitude of motional EMF.
Important Questions from Electromagnetic Waves
Consider the two statements given below :
Statement-1: Infrared waves are also called heat waves.
Statement-2: Water molecules readily absorb infrared waves.
Select the correct answer using the code given below:
- Which region of the electromagnetic spectrum is precisely utilized in LASIK eye surgery, primarily due to its high photon energy allowing for the breaking of molecular bonds and 'cold ablation' of corneal tissue without significant thermal damage?
The magnetic field of a plane electromagnetic wave is given by Bx = 2 × 10-7 sin (0.6 × 103y + 2 × 1011t) T. An expression for its electric field is :
Which of the following rays are used in doing LASIK (Laser - Assisted in Situ keratomileusis) eye surgery?
- The ratio of the intensity of magnetisation ($M$) developed in a material to the applied magnetising force ($H$) is a dimensionless constant. This constant quantitatively describes how easily a material can be magnetised in response to an external magnetic field. What is this constant termed?
