Litmus paper and phenolphthalein
To solve this problem we need to consider the concept about Ampere's Law.
The Ampere's law say that,
Where,
F= Mangetic field
Permeability of free space
I =current
R= Radius from the wire in meters.
A) At the first case the force on wire is repulsive, replacing our values
In repulsive direction.
B) At the second case de Force flow in the same direction, then we have,
In attractive direction
That is false the part of the electromagnetic spectrum that you can see is visible light
work done=446.9 J . so option (c) is correct.
Explanation:
the formula for work done is given by
W= F d
F= force= mg where m= mass and g= acceleration due to gravity
F= 3.8 (9.8)=37.24 J
so W=37.24 (12)
W=446.9 J