CBSE Class 12-science Physics Ohm's Law
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- What is ohm's law in vector form?
- What kind of charges constitutes the electric current?
- Why solid conductors conduct electricity when placed in an electric field?
- Electric current has both magnitude and direction but it is not a vector quantity. Why?
- What is conventional current?
- What will be the resistivity of a wire if it is stretched to double of its original length without loss of mass?
- Find the resistivity of a conductor in which a current density is
and electric field of 15Vm-1 is applied on it.
- Two wires of equal lengths, one of copper and other nickel have the same resistance. Which wire is thicker?
- What is the ratio of resistances of two conductors of same material having length l and 2l and radius r and r/2 respectively?
- Two wires A and B are of same material, have same area of cross-section and have their length in the ration 2: 1. What will be the ratio of current flowing through them if the same potential is applied across the length of each of them?
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