मराठी

Name the Material Which is the Best Conductor of Electricity. - Science

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प्रश्न

Name the material which is the best conductor of electricity.

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उत्तर

Silver is the best conductor of electricity.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 1: Electricity - Exercise 4

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संबंधित प्रश्‍न

When a 4 Ω resistor is connected across the terminals of a 12 V battery, the number of coulombs passing through the resistor per second is:

(a) 0.3
(b) 3
(c) 4
(d) 12


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Calculate the combined resistance in each case: 


A p.d. of 4 V is applied to two resistors of 6 Ω and 2 Ω connected in series. Calculate:

(a) the combined resistance
(b) the current flowing
(c) the p.d. across the 6 Ω resistor


State the order of resistivity of (i) a metal, (ii) a semiconductor and (iii) an insulator. 


What is electrical resistance? Write its SI unit.

What are the SI units of specific resistance?

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What potential difference is needed to drive a current o f 1 A through a 5 Ω resistor?


What do you mean by power rating of an electrical appliance? How do you use it to calculate 

(a) the resistance of the appliance and

(b) the safe limit of the current in it, while in use?


Choose the correct alternative and rewrite the following sentence.

If three resistors 2 ohms, 3 ohms and 4 ohms are connected in series, then the effective resistance in the circuit will be _______ ohms.


How does the resistivity of an alloy such as constantace depends on temperature.


Define the term resistivity and state its S.I. unit. Which will have higher resistivity a conductor or an insulator.


Write an expression for calculating electrical power in terms of current and resistance.


Two lamps of resistance 30Ω and 20Ω respectively are connected in series in a 110V circuit. Calculate:
(i) the total resistance in the circuit
(ii) the current in the circuit, and
(iii) the voltage drop across each lamp.


What should be the length of a nickel wire of area of cross-section 3 mm2 used for making a rheostat of 750 ohm? (ρ of nickle = 0.069 Ohm mm2/m)


Two wires of same material and same lengths have radii in the ratio of 2 : 3, Compare their resistances.


If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be:


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