Physics questions
20027 published questions with worked solutions.
- A can filled with water is revolved in a vertical circle of radius 'r' and water just does not fall down. The time period of...
- The relation between current and potential difference is given by
- The V-graph for a conductor makes angle with y-axis. Here V denotes voltage and I denote current. The resistance of the conductor...
- When the potential difference applied across a solid conductor is increased, the rate of flow of electrons
- In case of liquids, the Ohm’s law is
- For the validity of Ohm’s law, which of the following quantity is constant ?
- In a closed circuit, the e. m. f. and internal resistance of the generator are E and r respectively. If the external resistance...
- An external resistance R is connected to a cell of internal resistance r. the current in the circuit is maximum when
- S. I. unit of conductance is
- A conductor of length l and area of cross-section A has a resistance R then its specific resistance is
- The resistance of the material of unit length and unit area of cross section is
- If the length and area of cross section of a conductor are doubled, its resistance will be
- If ‘n’ is the number of free electrons in a metallic wire, then the resistance is proportional to
- The example of a non-ohmic resistance is
- If a wire of resistance 25 , is uniformly stretched until its length becomes three times its original length then its new...
- A wire of 50 cm long and 1 mm^2 in cross section carries a current of 4 A when connected to 2 V battery. The resistivity of the...
- Two wires of the same metal have same length, but their cross-sections are in the ratio 3 : 1. They are joined in series. The...
- A wire 1m long has a resistance of 1 , . if it is uniformly stretched, so that its length increases by 25 % then its resistance...
- The Resistance of conductor increases with temperature due to
- Length of conductor is doubled, its conductance will be :