MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Motional EMF

A metal rod m...

Question

A metal rod moves at a constant velocity in a direction perpendicular to its length. A constant uniform magnetic field exists in space in a direction perpendicular to the rod as well its velocity. Select correct statements (s) from the following

A

the entire rod is at the same potential

No worries! We‘ve got your back. Try BYJU‘S free classes today!

B

there is an electric field in the rod

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

C

the electric potential is highest at the centre

No worries! We‘ve got your back. Try BYJU‘S free classes today!

D

the electric potential is lowest at its centre and increases towards its ends

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is D there is an electric field in the rod
The moving rod develops an electric field = Bvl
and the EMF induced is such that it opposes the change of magnetic field.
Due to shifting of electrons, one end of the rod becomes positive and the other end negative. This developes a electric field in the rod.

Suggest Corrections

thumbs-up

1

Similar questions

Q. A metal rod moves at a constant velocity in a direction perpendicular to its length. A constant, uniform magnetic field exists in space in a direction perpendicular to the rod as well as its velocity. Select the correct statement(s) from the following.

Q. A metal rod of length l, moving with an angular velocity

ω

has velocity of its centre as v. A uniform magnetic field of strength B exists perpendicular to plane of paper. Potential difference between points A and B at the instant shown in figure is:

20 c m

long conducting rod is set into pure translation with a uniform velocity of

10 c m s^{- 1}

perpendicular to its length. A uniform magnetic field of magnitude

0.10 T

exists in a direction perpendicular to the plane motion. (a) Find the average magnetic force on the free electrons of the rod. (b) For what electric field inside the rod, the electric force on a free electron will balance the magnetic force? How is this electric field created? (c) Find the motional emf between the ends of the rod.

Q. A 20 cm long conducting rod is set into pure translation with a uniform velocity of 10 cm s⁻¹ perpendicular to its length. A uniform magnetic field of magnitude 0.10 T exists in a direction perpendicular to the plane of motion. (a) Find the average magnetic force on the free electrons of the rod. (b) For what electric field inside the rod, the electric force on a free elctron will balance the magnetic force? How is this electric field created? (c) Find the motional emf between the ends of the rod.

Q. A rod of length

1 m

rotates with a constant angular velocity of

8 rad/s

about its perpendicular bisector. A uniform magnetic field of

0.3 T

exists parallel to the axis of rotation. The potential difference between the center of the rod and its end is :

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Motional EMF

PHYSICS

Watch in App

explore_more_icon

Explore more

Standard XII Physics

Join BYJU'S Learning Program

CrossIcon