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Q.

Is it true that in an open key position no bulb will glow?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
No bulb will glow if the key is in an open position, as the current will not flow because a closed loop is required in the circuit for the current to flow. More clearly, the electrons could not complete the movement from one source terminal to the other terminal, resulting in no current flow through the circuit. Hence, the given statement is true..
 
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