
Consider the circuit below. The bulb will light up if:
A. and are all closed
B. is closed but and are open
C. and are closed but is open
D. None of these.
Answer
492.9k+ views
Hint: Rate of flow of charge is current. The resistors can be connected in series or in parallel with the battery. In case of series connection the current flowing through all the resistors will be the same. In case of parallel connection current flowing will be divided into branches according to their resistances.
Formula used:
Complete answer:
A material which allows current to pass through it is known as a conductor. No conductor will be perfect. It will have some resistance. The property to hinder the flow of current is called resistance and a device which does that is known as a resistor.
If the same current is passing through all resistors then we tell those are connected in series. If potential difference is the same for all resistors then those resistors are told to be in parallel.
When we had connected the iron and toaster and refrigerator in parallel, the potential difference would be the same across all the devices. Only the current flowing through the circuit will be divided. When resistors are connected in parallel effective resistance will be
In the below diagram
If switch one and switch two are closed then both will be having zero resistances and they will be in parallel. Effective resistance will be
So when resistance is zero current will go through that path we call it as short circuited.
Now if the third switch is closed then that wire will be short circuited and the entire current passes through that short circuited wire and no current passes through the bulb. So the third switch must be open.
So when is closed but and are open the bulb will glow
This condition is only satisfied by the second option.
So option B be the answer.
Note:
The main property of current is it always chooses the least resistant path. So when we short circuit any wire, its resistance will become zero i.e the least we can get. Hence current will flow through that path and don’t flow through the bulb. Then the bulb will not glow. Even if we close the first and second switches and open the third switch then the bulb will glow.
Formula used:
Complete answer:
A material which allows current to pass through it is known as a conductor. No conductor will be perfect. It will have some resistance. The property to hinder the flow of current is called resistance and a device which does that is known as a resistor.
If the same current is passing through all resistors then we tell those are connected in series. If potential difference is the same for all resistors then those resistors are told to be in parallel.
When we had connected the iron and toaster and refrigerator in parallel, the potential difference would be the same across all the devices. Only the current flowing through the circuit will be divided. When resistors are connected in parallel effective resistance will be
In the below diagram

If switch one and switch two are closed then both will be having zero resistances and they will be in parallel. Effective resistance will be
So when resistance is zero current will go through that path we call it as short circuited.
Now if the third switch is closed then that wire will be short circuited and the entire current passes through that short circuited wire and no current passes through the bulb. So the third switch must be open.
So when
This condition is only satisfied by the second option.
So option B be the answer.
Note:
The main property of current is it always chooses the least resistant path. So when we short circuit any wire, its resistance will become zero i.e the least we can get. Hence current will flow through that path and don’t flow through the bulb. Then the bulb will not glow. Even if we close the first and second switches and open the third switch then the bulb will glow.
Recently Updated Pages
Master Class 11 Business Studies: Engaging Questions & Answers for Success

Master Class 11 Economics: Engaging Questions & Answers for Success

Master Class 11 Accountancy: Engaging Questions & Answers for Success

Master Class 11 Computer Science: Engaging Questions & Answers for Success

Master Class 11 Maths: Engaging Questions & Answers for Success

Master Class 11 English: Engaging Questions & Answers for Success

Trending doubts
1 Quintal is equal to a 110 kg b 10 kg c 100kg d 1000 class 11 physics CBSE

How do I get the molar mass of urea class 11 chemistry CBSE

How do I convert ms to kmh Give an example class 11 physics CBSE

Where can free central placentation be seen class 11 biology CBSE

What is the molecular weight of NaOH class 11 chemistry CBSE

What is 1s 2s 2p 3s 3p class 11 chemistry CBSE
