विशिष्ट प्रतिरोध एवं प्रतिरोध Resistance and Specific Resistance | 12th/JEE/NEET Physics ✔ Gopal Sir

An aluminium wire carrying a current has diameter 0.84 mm . The electric field in the wire 0.49 V//m . What is (a) the current carried by the wire? (b) the potential difference between two points in the wire 12.0 m apart? (c) the resistance of a 12.0 m length of this wire? Specific resistance of aluminium is 2.75 xx 10^-8 Omega -m.

The external diameter of a 314 m long copper tube is 1.2 cm and the internal diameter is 1 cm. calculate its resistance if the specific resistance of copper is 2.2xx10^(-8) ohm-metre.

A thin uniform wire AB of length 1 m , an unknown resistance X and a resistance of 12 Omega are connected by thick conducting strips, as shown in the figure. A battery and a galvanometer (with a sliding jockey connected to it) are also available. Connections are to be made to measure the unknown resistance X . Using the principle of Wheatstone bridge answer the following questions : (a) Are there positive and negative terminals on the galvanometer? (b) Copy the figure in your answer book and show the battery and the galvanometer (with jockey connect at appropriate points. (c) After appropriate connections are made, it is found that no deflection takes place in th, from galvanometer when the sliding jockey touches the wire at a distance of 60 cm from A . Obtain value of the resistance X.

Circuit Theory - Current Electricity | Physics for JEE, NEET, CLASS 12

[" (ii) The physical quantity which having units ohm-meter "],[[" (A) "" Specific resistance "," (B) resistance "],[" (C)conductance "," (D) current density "]]

The specific conductance of a N//10 KCI solution at 18^(@)C is 1.12 xx 10^(-2) mho cm^(-1) . The resistance of the solution contained in the cell is found to be 65 ohms. Calculate the cell constant.

Solve the following crossword using the given clues: ACROSS 3. Principle relating to the apparent weight of a body when immersed in water. 6. Pressure caused by the weight of the air 7. Forces that require physical contact between objects 10. The force that exists between two magnets. 11. Unit of force 12. The resistance to movement that occurs when two bodies are in contact 13. The state when aperson does not feel any sensation of weight. DOWN 1. The pull of the earth 2. SI unit of pressure 4. Measure of the amount of matter in a physical body 5. The upward force that a fluid exerts on an object that is immersed in the fluid. 8. The force with which the earth pulls a body towards its centre. 9. Something that tends to cause movement of a body.