Q7 of 45 Page 301

An overhead wire carries current from east to west. Find the direction of the magnetic field 5cm below the wire.

The direction of the magnetic field is given by the right hand thumb rule, as the direction of the current is from east to


west, the direction of the magnetic field 5cm below will be from north to south.


More from this chapter

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5

An object is placed 25 cm from a convex lens whose focal length is 10 cm. The image distance is ________. (50 cm, 16.66 cm, 6.66 cm, 10 cm)

 6

From the following statement write down that which is applicable to a commutator?

a. A galvanometer uses a commutator for deadbeat


b. A transformer uses a commutator to step up voltage


c. A motor uses a commutator to reverse the current


 8

In the arrangement shown in the figure, there are two coils wound on anon-conducting cylindrical rod. Initially the key is not inserted. Then the key is inserted and later removed. Then, which of the following statement is correct?

a. The deflection in the galvanometer remains zero throughout.


b. There is a momentary deflection in the galvanometer but it dies out shortly.



 9

Which part of the human eye helps in changing the focal length of the eye lens?