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A wire is 1.0 m long, 0.2 mm in diameter and has a resistance of 10 Ω. Calculate the resistivity of its material?
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What will be the resistance of a metal wire of length 2 metres and area of cross-section 1.55 × 10−6 m2 if the resistivity of the metal be 2.8 × 10−8 Ω m?
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Give two examples of substances which are good conductors of electricity. Why do you think they are good conductors of electricity?
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Calculate the resistance of a copper wire 1.0 km long and 0.50 mm diameter if the resistivity of copper is 1.7 × 10−8 Ω m.
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How does the resistance of a conductor depend on:
length of the conductor?
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How does the resistance of a conductor depend on:
area of cross-section of the conductor?
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How does the resistance of a conductor depend on:
temperature of the conductor?
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What would be the effect on the resistance of a metal wire of:
increasing its length?
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What would be the effect on the resistance of a metal wire of:
increasing its diameter?
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What would be the effect on the resistance of a metal wire of:
increasing its temperature?
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How does the resistance of a wire change when:
its material is changed to one whose resistivity is three times?
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Calculate the area of cross-section of a wire if its length is 1.0 m, its resistance is 23 Ω and the resistivity of the material of the wire is 1.84 × 10−6 Ω m.
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The figure blow shows a variable resistor in a dimmer switch.
How would you turn the switch to make the lights: (a) brighter, and (b) dimmer? Explain your answer.
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The back face of a circular loop of wire is found to be south magnetic pole. The direction of current in this face of the circular loop of wire will be:
(a) towards south
(b) clockwise
(c) anticlockwise
(d) towards north
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State two characteristics of the chemical reaction which takes place when dilute sulphuric acid is poured over zinc granules.
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Why does the colour of copper sulphate solution change when an iron nail is kept immersed in it?
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What type of chemical reaction is represented by the following equation?
A + BC → AC + B
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What type of chemical reaction is represented by the following equation?
A2O3 + 2B → B2O3 + 2A
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what type of reaction is the following:
Cl2 + 2KI → 2KCl + I2
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What type of reaction is represented by the following equation?
2Na + 2H2O → 2NaOH + H2
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