Question

A plate composed of welded sheets of aluminium and iron is connected to an electrical circuit as shown in fig. What will happen if a fairly strong current be passed through the circuit? (a) Strip bends upward (b) Strip bends downward (c) Strip remains in its initial condition (d) None of the above

Name: Problem 19, Chapter 15: Arihant AIEEE Physics
Uploaded: 2021-09-19T14:44:45-08:00
Duration: 1 min 32 s
Channel: Ajay Singhal
Description: A plate composed of welded sheets of aluminium and iron is connected to an electrical circuit as shown in fig. What will happen if a fairly strong current be passed through the circuit? (a) Strip bends upward (b) Strip bends downward (c) Strip remains in its initial condition (d) None of the above

   A plate composed of welded sheets of aluminium and iron is connected to an electrical circuit as shown in fig. What will happen if a fairly strong current be passed through the circuit?
(a) Strip bends upward 
(b) Strip bends downward
(c) Strip remains in its initial condition
(d) None of the above

Arihant AIEEE Physics

D.B. Singh 2006 Edition

Chapter 15, Problem 19

Instant Answer

Solved by Expert Ajay Singhal

09/19/2021

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A plate composed of welded sheets of aluminium and iron is connected to an electrical circuit as shown in fig. What will happen if a fairly strong current be passed through the circuit? (a) Strip bends upward (b) Strip bends downward (c) Strip remains in its initial condition (d) None of the above

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Key Concepts

Bimetallic Strip

A bimetallic strip is a composite structure made by bonding two metals with different thermal expansion coefficients. When heated, each metal expands by a different amount, causing the strip to bend due to the mismatch in expansion.

Joule Heating

Joule heating refers to the generation of heat when an electric current flows through a conductor. In the context of a bimetallic strip integrated into an electrical circuit, this heating causes the temperature rise that leads to the differential expansion of the bonded metals.

Differential Thermal Expansion

Differential thermal expansion is the principle that materials expand at different rates when heated. In a bimetallic strip, the metal with a higher coefficient of expansion elongates more than the other, resulting in curvature of the strip.

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