A circular loop is kept in that vertical plane which contains the north-south direction. It carries a current that is towards north at the topmost point. Let A be a point on the axis of the circle to the east of it and B a point on this axis to the west of it. The magnetic field due to the loop
1. is towards east at A and towards west at B
2. is towards west at A and towards east at B
3. is towards east at both A and B
4. is towards west at both A and B
A long, straight wire carries a current along the \(z-\)axis. One can find two points in the \(X-Y\) plane such that:
(a) | the magnetic fields are equal |
(b) | the direction of the magnetic fields are the same |
(c) | the magnitude of the magnetic fields are equal |
(d) | the field at one point is opposite to that at the other point |
Choose the correct option :
1. | (a), (b), (c) | 2. | (b), (c), (d) |
3. | (c), (d), (a) | 4. | all of the above |