If the current in each wire is the same, which wire produces the strongest magnetic field? a. a wire that is 1 mm thick and not coiled b. a wire that is 2 mm thick and not coiled c. a 1-mm-thick coiled wire with ten loops d. a 2-mm-thick coiled wire with two loops

The correct answer is option C.

Explanation:

B = strength of the magnetic field

r = radius of the wire end =

diameter = width or thickness of the wire

I = current carried by the wire

Strength of magnetic field in the wire is inversely related with radius of the end of the wire.

Magnetic field increases with increase in number of loops.

So, wire with less thickness and more number of the coils will have big strength of magnetic field.

Hence, from the given options the correct option is C.

d. air pressure decreases as altitude increases.