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Q.

Initially when a bulb is set up in the circuit it does not glow but when more cells are added it glows. What does that mean?


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a

Initially voltage was not enough

b

All bulb required more than one cell

c

Bulb takes some time to start glowing

d

None of these  

answer is A.

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Detailed Solution

Initially when a bulb is set up in the circuit it does not glow but when more cells are added it glows. That means initially the voltage was not enough.
Question Image For glowing any bulb, a minimum voltage is required according to the type and spec. of bulb. In this case initially voltage was not more than minimum required voltage but when more cells are added the voltage increases and it crosses the minimum limit and the bulb starts glowing.         
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