Which one of the following physical quantities does NOT affect the resistance of a cylindrical resistor ?

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Q: 60 (NDA-I/2017)

Which one of the following physical quantities does NOT affect the resistance of a cylindrical resistor ?

question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,4,7,4,2,4,1

keywords: 

{'cylindrical resistor': [0, 0, 0, 1], 'resistance': [0, 0, 1, 2], 'resistivity': [0, 0, 0, 2], 'resistor': [0, 0, 1, 0], 'physical quantities': [0, 0, 0, 1], 'cylinder': [0, 2, 1, 2], 'length': [0, 0, 1, 0]}

The correct answer is option 1 - The current through it.

The resistance of a cylindrical resistor primarily depends on its length (option 2), the resistivity of the material used in the resistor (option 3), and the area of the cross-section of the cylinder (option 4).

The length of the resistor affects the resistance because a longer resistor will have more resistance as the current has to pass through a longer path.

The resistivity of the material used is a property that determines how much resistance the material offers to the flow of electric current.

The area of the cross-section of the cylinder affects resistance because a larger area provides more space for current flow, resulting in less resistance.

However, the current through the resistor (option 1) does not directly affect the resistance. The current is influenced by the resistance, but it does not have a direct effect on it.

Therefore, option 1 is the correct answer.

Alert - correct answer should be: None of the above. The current through a cylindrical resistor does affect the resistance. As the current increases, the resistance also increases. This can be understood by Ohm`s law, which states that resistance is equal to voltage divided by current. So, an increase in current will result