A circular loop of radius r carries a charge q distributed uniformly on it. It is rotated at a frequency
v about its axis. A uniform magnetic field B acts along the axis of the loop. The torque on the loop
due to the magnetic field is
1) IN-
2) 2N - m
3) 3N-m
+) zero
Answers
Answer:
Initially the field at the center is zero, i.e., field due to all the elements of the circular wire cancel each other.
field at the center after removing "x" length of wire = field at center due to "x" length of wire
=
4πϵ
o
1
q
x
R
2
=
4πϵ
o
1
2πRR
2
qx
(∵q
x
=
2πR
qx
)
=
8πϵ
o
R
3
qx
Explanation:
plz vote me
Concept
A uniform magnetic field is represented by parallel straight lines at equal intervals. The direction of the magnetic flux is the direction pointed to by the north pole of the small magnet.
Explanation
The field at the center is zero initially means every element of circular wire cancel each other.
After removing the field at the center is x length of wire
= field at the center because of x length of wire
= 1 / 4π0*qxR^2
= 1 / 4π0*qx/2RR^2
Where qx = qx / 2πR
= qx/8πR^3
Hence the magnetic field is zero
#SPJ3