71. Lenz's Law is consequence of the law of conservative of
72. Which of the following option represents the consumption of power in ascending order?
73. Two wires are made having same length l and area of cross-section A. Wire 1 is made of copper and wire 2 is made of aluminium. It is given that the electrical conductivity of copper is more than that of aluminium. In this context, which one of the following statements is correct?
74. A positively charged particle projected towards West is deflected towards North by a magnetic field. What is the direction of magnetic field?
75. If the potential difference between the terminals of the electric heater is 60 V, when it receives a current of 4A from the source. If the potential difference increases to 150V, what will be the current received by the heater?
76. If the electric charge (Q) and time (t) are given, what would be the formula for determining the electric current (I)?
77. The work done is 36J across two points which have potential different of 12V. The electric charge flowing across those points is . . . . . . . .
78. Which of the following law is related to the heating effect of electric current?
79. An electric bulb of 100 watt is used for 4 hours. The unit of electric energy used is
80. How much work is done in moving a charge of 4 C across two points having a potential difference of 11V?
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