81. What is the net force experienced by a bar magnet placed in a uniform magnetic field?
82. Three resistors with magnitudes 2, 4 and 8Ω are connected in parallel, then equivalent resistance of the system would be
83. Electric current in a metal wire is due to the flow of
84. What is the relation between electric current and potential difference across the conductor?
85. The metal used to make lightning conductor is
86. Who among the following introduced the concept of electric field for the first time?
87. The two resistance of 10Ω and 20Ω in series combination are connected with 6V batteries. The electric current in the circuit will be-
88. Which one of the following physical quantities does not affect the resistance of a cylindrical resistor?
89. The basic difference between an AC generator and a DC generator is that
90. Which of the following devices detects the current in the circuit?
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