71. Which of the following represents a relation for ''heat lost = heat gained'?
72. Q = mcdT refers to
73. Steam at 100°C causes more severe burns than water at 100°C because
74. No current will flow between two charged bodies if they have the same
75. Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes
76. Find the resistance (in mega) of a wire of length 20m, cross sectional area 1 cm2 and made of a material of resistivity 200m.
77. A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be
78. Which of the following is a good conductor of heat but a bad conductor of electricity ?
79. When a number of resistors are connected in series in a circuit, the value of current:
80. A good conductor while carrying current is
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