Science Answer the questions.[Phy-3M]

a.

the poles are mentioned in the given figure and the magnetic field will be stronger at the end of the pole.
b. If magnetic field lines intersect each other, then at the intersection point there will be two directions of the same field which is not possible. Hence the field lines do not cross or intersect each other.

The resistance of an ammeter should be low. An ammeter has to be connected in series with the circuit to measure current. In case, its resistance is not very low, its inclusion in the circuit will reduce the current to be measured. In fact, an ideal ammeter is one which has zero resistance.

There are mainly four common defect of vision that can be corrected by the use of suitable eyeglasses or spectacles. There are
i. Myopia or near-sightedness,
ii. Hypermetropia or far-sightedness,
iii. Presbyopia, and
iv. Astigmatism