Answer:
Option D.
Explanation:
The correct answer is Option D.
The shrinkage of the bridge material is because of thermal contraction.
Thermal contraction and thermal expansion are the phenomena of the bridge material which takes place due to the change in temperature of the atmosphere.
When the temperature of the surrounding increases expansion of the bridge material takes place and when temperature decreases the contraction of the material takes place.
This phenomenon sometimes damages the structure because due to continuous expansion and contraction of materials strength of the bridge decreases.
WE are given
I2 = 50 A
The formula for the net force is
F = I2 L B
where I2 is the current
L is the length
and
B is the magnetic field
If we know L and B, we can substitute the values into the formula and solve fore the force
It would <span>keep rolling without slowing down if no friction acted upon it.
</span>
2.27 mps repeating.
This is the last question ill ever answer here. Thanks for being the last.