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Q.

Choose the symbol for variable resistance:


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a

 Question Image 

b

Question Image

c

 Question Image

d

 Question Image 

answer is C.

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Detailed Solution

Concept: In a variable resistor, the electrical resistance is adjusted.
It changes the resistance and is according to the current flowing in it. It helps in controlling the current by providing enough resistance to the circuit. It can also control voltage across two devices together.
Hence, the correct option is 3
 
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