81. Turbines and Dyanamos are used to convert which energy to electrical energy?
82. In AC circuits, AC meters measure
83. The work done across two points having 10 V potential difference is 30 J. So the electric charge flowing between the two points will be-
84. When a bar magnet is cut into two equal halves, the pole strength of each piece
85. What is the name of the device used to convert alternating current into direct current?
86. The amount of electric charge flowing through electric circuit in 10 minutes is 300 coulombs. Find the electric current drawn by the filament of the electric bulb is?
87. Which one of the following can charge an insulator?
88. Given below are two statements, one labelled as Assertion (A) and the other labelled as Reason (R).
Assertion (A): Transformer is useful for stepping up or stepping down voltages.
Reason (R): Transformer is a device used in D.C. circuits.
In the context of the above two statements, which one of the following is correct?
Assertion (A): Transformer is useful for stepping up or stepping down voltages.
Reason (R): Transformer is a device used in D.C. circuits.
In the context of the above two statements, which one of the following is correct?
89. The SI unit of electric charge is
90. If a copper wire is increased to double its length, its resistance will become
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