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Two conducting wires of lenghts l and 2l...

Two conducting wires of lenghts l and 2l have the same cross-sectional area.Compare their resistances.

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The resistance R of a conducting wire depends on its material , length l and area of cross section A. The resistivity of the material of the wire is rho=(RA)/l the value of rho is for different materials .It is very low for conducting materials like metals,Besides, the resistance of a conductor also depends on its temperature. IF the resistance of a conductor is R_0 at 0^@C and R_1 at t^@C , then R_1=R_0(1+at) where a is called the temperature coefficient of resistance. The resistance increases with temperature for metallic conductors but decreases for graphite,a few metal alloys,and for semiconductors like silicon and germanium. The length of this metal wire is doubled by stretching .What will be the change in its resistance?

The resistance R of a conducting wire depends on its material , length l and area of cross section A. The resistivity of the material of the wire is rho=(RA)/t the value of rho is for different materials .It is very low for conducting materials like metals,Besides, the resistance of a conductor also depends on its temperature. IF the resistance of a conductor is R_0 at 0^@C and R_1 at t^@C , then R_1=R_0(1+at) where a is called the temperature coefficient of resistance. The resistance increases with temperature for metallic conductors but decreases for graphite,a few metal alloys,and for semiconductors like silicon and germanium. The temperature coefficient of resistance of a semiconductor is

The resistance R of a conducting wire depends on its material , length l and area of cross section A. The resistivity of the material of the wire is rho=(RA)l the value of rho is for different materials .It is very low for conducting materials like metals,Besides, the resistance of a conductor also depends on its temperature. IF the resistance of a conductor is R_0 at 0^@C and R_1 at t^@C , then R_1=R_0(1+at) where a is called the temperature coefficient of resistance. The resistance increases with temperature for metallic conductors but decreases for graphite,a few metal alloys,and for semiconductors like silicon and germanium. The resistance of a metal wire increases by 10% when its temperature rises from 10^@C to 110^@C .The temperature coefficient of resistance of the metal is

Two wires A and B have the same cross section and are made of the same material but the length of wire A is twice that of B. Then for a given load

The young modules of an wire of length ‘L’ and cross sectional area alpha is y The wire is extended in length within elastic‘limit with a stress's’. Calculate the energy density stored in the wire.

Two wires are made of the same material and have the same volume. The first wire cross sectional area A and the second wire has cross sectional area 3A. If the length of the first wire is increased by Delta l on applying a force F, how much force is needed to stretch the second wire by the same amount?

CHHAYA PUBLICATION-CURRENT ELECTRICITY -EXERCISE ( VERY SHORT ANSWER TYPE QUESTION)
  1. Resistivity of copper is 1.76 times 10^-6 Omega.cm. Express it in ohm....

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  2. Resistivity of copper is 1.76 times 10^-6 Omega.cm. Determine the resi...

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  3. Two conducting wires of lenghts l and 2l have the same cross-sectional...

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  4. Two wires A and B are of the same metal and of the same length. Their ...

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  5. What will be the change in the resistance of the Eureka wire,when its ...

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  6. Two wires A and B of the same metal have the same across sectional are...

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  7. Name a substance whose resistance decreases with in the increases in t...

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  8. What is the unit of temperature coefficient of resistance?

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  9. The temperature coefficient of resistance for the material of a conduc...

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  10. A carbon resistor is coloured with four different bands=brown,black,or...

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  11. Resistance of a carbon resistor is 6.8 k Omega.What is the first three...

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  12. Of metals and alloys,which has greater value of temperature coefficien...

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  13. How are different electrical appliances connected In domestic electric...

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  14. Two resistances 1 Omega and 2 Omega are connected in series and a pote...

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  15. Two resistances 1 Omega and 2 Omega are connected in parallel and a p...

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  16. What is the value of I in the circuit of Fig.1.64?

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  17. Equivalent resistance in a parallel combination is ...... than each of...

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  18. Two resistance of 6 Omega and 3 Omega are connected in parallel when ...

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  19. A metallic wire of resistance R is folded into two equal parts and the...

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  20. The resistance of an electrical appliance is 200 Omega and it can with...

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