#9 | Ohm's Law in Vector Form
(Physics) > Current Electricity
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Related Practice Questions :

A wire having resistance 16Ω is stretched to double of its original length. The new resistance of the wire will be: 

1.  4Ω  

2.  8Ω  

3.  32Ω

4.  64Ω

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The resistance of a platinum wire at 0°C is 22.05Ω and at 100°C it becomes 22.70Ω. When the wire is heated to a temperature of t°C the resistance of wire becomes 24.91Ω. The value of t is

1.  220

2.  440

3.  310

4.  550

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Three copper wires have their lengths in the ratio 5:3:1 and their masses are in the ratio 1:3:5. Their electrical resistance will be in the ratio of :

1. 5:3:1

2. 1:3:5

3. 125:15:1

4. 1:15:125

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The resistivity of iron is 1 × 10–7 ohm m. The resistance of iron wire of particular length and thickness is 1 ohm. If the length and the diameter of wire both are doubled, then the resistivity in ohm m will be :

(1) 1 × 10–7

(2) 2 × 10–7

(3) 4 × 10–7

(4) 8 × 10–7

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When the length and area of cross-section both are doubled, then its resistance :

(1) Will become half

(2) Will be doubled

(3) Will remain the same

(4) Will become four times

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