Answer the questions.[Phy-3M]

Question 13 Marks

a. Draw the pattern of magnetic field lines around a bar magnet. Mark the position of North Pole, South Pole and the places where the magnetic field is strongest.
b. Why do the magnetic field lines not intersect each other?

Answer

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.

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Question 23 Marks

A camera in many ways is similar to the human eye, still, there are some basic differences in image formation between the two. Explain.

Answer

A camera in many ways is similar to the human eye as both eye and camera has convex lens. But, there are some basic differences in image formation between the two as follows:
i. In camera, the distance between the lens and the screen can be adjusted but not the focal length of the lens. However, in eye, the ciliary muscles adjust the focal length keeping the distance between the lens and the retina constant.
ii. The image formed on the retina is temporary and its impression is recorded in the brain as memory. However, the image formed on the film of camera is a permanent record.

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Question 33 Marks

Find the direction of magnetic field due to a current carrying circular coil held:
i. Vertically in North-South plane and an observer looking it from East sees the current to flow in anticlockwise direction.
ii. Vertically in East-West plane and an observer looking it from South sees the current to flow in anti-clockwise direction.
iii. Horizontally and an observer looking at it from below and see the current flowing in clockwise direction.

Answer

i. When the coil is kept vertically in North-South plane and the current is flowing in the anti-clockwise direction through the loop, then the magnetic field is in the East-West direction.
ii. When the coil is kept vertically in East-West plane and current through the coil is in the anti-clockwise direction, then the magnetic field is in the South-North direction.
iii. In this case, the direction of the field for the observer positioned below the coil is in the downward direction.

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Science Answer the questions.[Phy-3M]

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