Q7 of 19 Page 60

Give Scientific reasons.

For electric power transmission, copper or aluminum wire is used.

Copper or aluminum are metals which have free electrons so they are good conductors of electricity. They have a low value of resistivity and are cheap and readily available so for electric power transmission, copper or aluminum wire is used.


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7

Give Scientific reasons.

Tungsten metal is used to make a solenoid type coil in an electric bulb.

 7

Give Scientific reasons.

In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster etc, an alloy such as Nichrome is used, not pure metals.

 7

Give Scientific reasons.

In practice, the unit kWh is used for the measurement of electrical energy, rather than joule.

 8

Which of the statement given below correctly describes the magnetic field near a long, straight current-carrying conductor?

a. The magnetic lines of force are in a plane, perpendicular to the conductor in the form of straight lines.


b. The magnetic lines of force are parallel to the conductor on all the sides of the conductor.


c. The magnetic lines of force are perpendicular to the conductor going radially outward.


d. The magnetic lines of force are in concentric circles with the wire as the center, in a plane perpendicular to the conductor.