MCQ
Magnetic lines of force
- AAlways intersect
- ✓Are always closed
- CTend to crowd far away from the poles of magnet
- DDo not pass through vacuum
Isolated single monopoles do not exist. We always get a pair of north and south pole only. The lines of force start from a north pole and end at a south pole. Hence magnetic lines of force are always closed curves. They are crowded where the field is strong and are less and far from each other where the field is weak. Far away from the poles of a magnet, the field is very weak. Hence over there they won't tend to crowd, but remain away from each other.
They can easily pass through vacuum.
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| Colum $I$ | Colum $II$ |
| $(A)$ $\frac{dv}{dt}$ | $(p)$ Acceleration |
| $(B)$ $\frac{d|v|}{dt}$ | $(q)$ Magnitude of acceleration |
| $(C)$ $\frac{dr}{dt}$ | $(r)$ Velocity |
| $(D)$ $\left|\frac{d r }{d t}\right|$ | $(s)$ Magnitude of velocity |
$(a)$ the electric field at the axis of wire is zero
$(b)$ the magnetic field at the axis of wire is zero
$(c)$ the electric field in the vicinity of wire is Zero.
$(d)$ the magnetic field in the vicinity of wire is Zero