(a) Table gives the resistivity of three materials in (in Ω m) A, B, C. Samples A B C Resistivity 1.6 x 10 -8 7.5 x 10 17 44 x 10 -6 Which one of them is the best conductor? And which is an insulator and why?

(a) Sample A having resistivity 1 . 6 × 10 - 8 is best conductor of electricity as its resistivity is low. Sample B is an insulator because it has the highest resistivity. So, its resistance will be maximum. So, it acts like an insulator. More the resistivity more will be the resistance. But, if resistance is more then flow of current will be less. Hence, it will be bad conductor of electricity.

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Xamidea COMPLETE COURSE SCIENCE Class X>Chapter 12 - Electricity>SELF-ASSESSMENT TEST>Q 1

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An electric current of $3 A$ flows through a circuit for $20$ minutes. What is the amount of charges flowing?

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Important Questions on Electricity

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10th CBSE

IMPORTANT

Xamidea COMPLETE COURSE SCIENCE Class X>Chapter 12 - Electricity>SELF-ASSESSMENT TEST>Q 1

Four cells each of emf

1.5 V

and the internal resistance

0.5 Ω

are connected in series but one cell is wrongly connected as shown in figure. The net voltage and net internal resistance between A and B is
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