A long straight wire with a circular cross-section having radius R, is carrying a steady current I. The current I is uniformly distributed across this cross-section. Then the variation of magnetic field due to current I with distance r (r < R) from its center will be
A
B 
r 2
r 2
B
B 
r
r
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Use Ampere s law
Thus 
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
The magnetic field at the center of a circular coil of radius r, due to current I flowing through i…
A proton, a deuteron and an a-particle with same kinetic energy enter into a uniform magnetic field…
A proton and an alpha particle of the same enter in a uniform magnetic field which is acting perpen…
A bar magnet having a magnetic moment of 2.0 x 10 5 JT -1 , is placed along the direction of unifor…
A metal surface is illuminated by a radiation of wavelength 4500 . The ejected photo-electron ente…
Two long parallel conductors S 1 and S 2 are separated by a distance 10 cm and carrying currents of…