CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

A circular coil of radius r having n turns carries a current i. The magnetic induction at the centre of the coil is B. Now the coil is unwound and rewound with half the original radius. If the magnetic induction at the centre of the coil is to be the same, the current that should be passed through the coil is :

A
2i
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
i
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
0.5i
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
0.25i
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is D 0.25i
As it is wound with half initial radius.
n(2Ar)=n1(2Ar2)
n1=2n
B=μ0ni2r
For B to be same. Let current passing be i1
B=μ0ni2r=μ021i12(r2)
i1=i4

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Magnetic Field Due to a Current Carrying Wire
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon