A small bulb has resistance of 2 Ohm when cold. It takes up a current of 0.4 ampere from a source of 4 volt and then start glowing.calculate (I) the resistance of the bulb when it is glowing (ii) elaborate the reason for the difference in resistance
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Explanation:
1.R=V/I=4/0.4=10 ohms
2.Due to the change in temperature
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