Question

Please answers the 1 and 2 ques?

Answer 1

1.) There is no change to the image distance in the eye when we increase the distance of an object from the eye. To see closer or distant object clearly, the eyes, due to its ability of accommodation, can increase or decrease focal length of its lens, so that the image is always formed at retina. The eye lens is composed of a fibrous, jelly-like material. To see closer or distant objects, focal length of its lenses can be increased or decreased to some extent by the contraction and relaxation of the ciliary muscles.

2.) The direction of magnetic field around a current carrying conduction is determined by using Ampere’s Thumb rule.

If you are facing towards current flowing direction ,the direction of magnetic field is in clockwise direction. Now in the question current flowing from west to east , so if you stand facing east direction ,at point below the conductor the magnetic field is towards north direction (clockwise).

Answer 2

1. The image is always formed at the retina. So image distance DOESN'T CHANGE.
When object distance is changed, the focal length of our lens changes so that the image can be formed at the retina. You know this ability of the lens to change its focal length as power of accommodation.
When you need to see objects near to your eye, it decreases it's focal length by bulging. And when you need to see objects which are far away, the lens becomes flatter.


2. The direction of current is:
- In the direction of flow of a positive charge
- In the opposite direction of flow of a negative charge

Since electron has negative charge, the direction of current is in the opposite direction of flow of electron.
So direction of current is west to east.