Find magnetic field at the center of flat coil of insulated current carrying wire, i, where radius of infinite coil relates to r = a(1+theta^2).

The magnetic field at the center of flat coil is .

Explanation:

Given that,

Radius

We need to calculate the magnetic field at the center of flat coil

Using Biot-savart law

Here,

Then, the magnetic field

Put the value of r

Hence, The magnetic field at the center of flat coil is .

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what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.