Consider the following : Heat produced in a conductor carrying current is independent of 1. current passing through it. 2. thermal conductivity. 3. specific resistance. Which of the statements given above is/are correct?

examrobotsa's picture

Submitted by examrobotsa on

Q: 81 (NDA-II/2008)
Consider the following : Heat produced in a conductor carrying current is independent of
1. current passing through it.
2. thermal conductivity.
3. specific resistance.
Which of the statements given above is/are correct?

question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,11,17,6,11,8,3

keywords: 

{'thermal conductivity': [0, 0, 1, 4], 'conductor': [0, 0, 1, 2], 'specific resistance': [0, 0, 1, 0], 'current': [0, 0, 0, 3], 'heat': [10, 3, 13, 46]}

The correct answer is option 2, which states that heat produced in a conductor carrying current is independent of thermal conductivity. Let`s analyze each option to understand why this is the correct answer:

Option 1 states that the heat produced in a conductor carrying current is independent of the current passing through it. This statement is incorrect. The heat produced in a conductor is directly proportional to the square of the current passing through it. Therefore, this option is not correct.

Option 2 states that the heat produced in a conductor carrying current is independent of thermal conductivity. This statement is correct. Thermal conductivity is a property of the material and does not affect the amount of heat produced in the conductor. Therefore, this option is correct.

Option 3 states that the heat produced in a conductor carrying current is independent of specific resistance. This statement is incorrect. Specific resistance, also known as resistivity, is a property of the material and affects the amount of heat produced. Higher resistivity leads to more heat production. Therefore, this option is not correct.

Alert - correct answer should be option 2 only.

Practice this on app