True orFalse? 1. Theresistance of a metal rod depends on temperature. 2. Theresi

Question

True orFalse?
1. Theresistance of a metal rod depends on temperature. 2. Theresistance of a metal rod does not depend on itsconductivity. 3. Theresistance of a metal rod with fixed cross-sectional area dependson the shape of the cross sectional area. 4. Acylindrical copper rod has resistance R. It is reformed to twiceits original length with no change of volume. Its new resistance isequal to 2R. 5. Acertain wire has a resistance R. Another wire, made of the samematerial, has half the length and half the diameter of the firstwire. The resistance of the second wire is equal to R.
True orFalse?
1. Theresistance of a metal rod depends on temperature. 2. Theresistance of a metal rod does not depend on itsconductivity. 3. Theresistance of a metal rod with fixed cross-sectional area dependson the shape of the cross sectional area. 4. Acylindrical copper rod has resistance R. It is reformed to twiceits original length with no change of volume. Its new resistance isequal to 2R. 5. Acertain wire has a resistance R. Another wire, made of the samematerial, has half the length and half the diameter of the firstwire. The resistance of the second wire is equal to R.

Explanation / Answer

1. True 2. False - resistivity is the inverse of conductivity andresistance is dependent on resistivity 3. False - as long as the shape is fixed 4. True - direct relationship 5. False - the second one has a value of 2R

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