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If the length and cross-section of a wire is doubled, then the resistance will

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Important Questions on Current Electricity

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 16
V-i graph for an ohmic resistance is
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 17
When a resistance wire is passed through a die the cross-section area decreases by 1%, the change in resistance of the wire is
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 18
When the resistance of copper wire is 0.1 Ω and the radius is 1 mm, then the length of the wire is (specific resistance of copper is 3.14×10-8 ohm m),
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 19
Three copper wires have lengths and cross-sectional areas as (l, A), (2l, A2) and (l2, 2A). Resistance is minimum in
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 20
The resistance of a wire of cross-section a and length l is R ohm. The resistance of another wire of the same material and of the same length but cross-section 4a will be
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 21
The resistance of wire is R ohm. The wire is stretched to half of its diameter. The resistance of the wire will now be 
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 22
If a wire of resistance R is stretched to double of its length, then the new resistance will be
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 23

All the edges of a block in cuboidal shape with parallel faces are unequal. Its longest edge is twice its shortest edge. The ratio of the maximum to minimum resistance between parallel faces is: (a>b>c)

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