Which changes would cause an increase in the resistance of a wire? Check all that apply. increasing its temperature decreasing its temperature using a longer wire using a shorter wire using a thicker wire using a thinner wire

Answers (1)

R=\rho \frac{L}{A}

where R is the resistance of a wire, \rho its resistivity, L its length and A its area.

From here we can say that 

1. R is direclty proportional to length, so if we use a longer wire,  the resistance increases.

2. R is inversely proportional to area, so if we use a thinner wire, that means we are decreasing the diameter of wire and if the diameter decreases then area will also decrease, therefore the resistance will increase.

3. Resistance is dependent of temperature by this formula, 

so when we increase the temperature of the wire, the atoms of the wire will move faster, so if a current passes through the wire, the electrons of the current collide more with the atoms of the wire: therefore, the resistance increases.

Preparation Products

Knockout NEET July 2020

An exhaustive E-learning program for the complete preparation of NEET..

₹ 15999/- ₹ 6999/-
Buy Now
Rank Booster NEET 2020

This course will help student to be better prepared and study in the right direction for NEET..

₹ 9999/- ₹ 4999/-
Buy Now
Knockout JEE Main July 2020

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 12999/- ₹ 6999/-
Buy Now
Test Series NEET July 2020

Take chapter-wise, subject-wise and Complete syllabus mock tests and get in depth analysis of your test..

₹ 4999/- ₹ 2999/-
Buy Now
Knockout NEET May 2021

An exhaustive E-learning program for the complete preparation of NEET..

₹ 22999/- ₹ 11999/-
Buy Now
Exams
Articles
Questions