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Q.4 (a) Draw and label a gold leaf electroscope. Explain how such an instrument can be used to distinguish between an insulator, a poor conductor and a good conductor

Q.4 (a) Draw and label a gold leaf electroscope. Explain how such an instrument can be used to distinguish between an insulator, a poor conductor and a good conductor

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Q.4 (a) Draw and label a gold leaf electroscope. Explain how such an instrument can be used to distinguish between an insulator, a poor conductor and a good conductor (b) Describe and explain what happens when the terminals of a charged capacitor are connected by a piece of copper wire (c) Plates were fixed on the top and bottom of a cubical box with each side equal to 2 cm. A capacitor was constructed out of this box by filling it with a suitable dielectric material. In an experiment with this capacitor, the charge stored was measured and the electric field between the plates was determined as the charging potential difference was varied. The results are tabulated below. Charge stored/uC 7.5 30 60 75 90 Electric 0.5 2.0 4.0 5.0 6.0 field/Vcm-1 Plot a suitable graph which can be used to determine the dielectric strength, and hence the capacitance of the capacitor used in this experiment. Calculate the total energy stored by the capacitor when the electric field is 400 V/m.
Transcribed Image Text:Q.4 (a) Draw and label a gold leaf electroscope. Explain how such an instrument can be used to distinguish between an insulator, a poor conductor and a good conductor (b) Describe and explain what happens when the terminals of a charged capacitor are connected by a piece of copper wire (c) Plates were fixed on the top and bottom of a cubical box with each side equal to 2 cm. A capacitor was constructed out of this box by filling it with a suitable dielectric material. In an experiment with this capacitor, the charge stored was measured and the electric field between the plates was determined as the charging potential difference was varied. The results are tabulated below. Charge stored/uC 7.5 30 60 75 90 Electric 0.5 2.0 4.0 5.0 6.0 field/Vcm-1 Plot a suitable graph which can be used to determine the dielectric strength, and hence the capacitance of the capacitor used in this experiment. Calculate the total energy stored by the capacitor when the electric field is 400 V/m.
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