Amagnetic field of 37.2 t has been achieved at the mit francis bitter national magnetic laboratory. find the current needed to achieve such a field

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a) Current for long straight wire  

b) Current at the center of the circular coil

c) Current near the center of a solenoid

Explanation:

⇒ Magnetic Field due to long straight wire is given by (B),where

Plugging the values,

Conversion ,and

⇒Magnetic Field at the center due to circular coil (at center) is given by,

So

⇒Magnetic field due to the long solenoid,

Then  

So the value of current are  , and respectively.

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