A flat, 179 179 ‑turn, current‑carrying loop is immersed in a uniform magnetic field. The area of the loop is 4.41 cm 2 4.41 cm2 and the angle between its magnetic dipole moment and the field is 59.9 ∘ . 59.9∘. Find the strength B B of the magnetic field that causes a torque of 2.25 × 10 − 5 N ⋅ m 2.25×10−5 N⋅m to act on the loop when a current of 2.49 mA 2.49 mA flows in it.

The value of the magnetic field is  

Explanation:

From the question we are told that

              The number of turns is  

               The area of the loop is

                 The angle is  

               The torque  is  

                The current is  

The torque acting on the current carry loop is  mathematically represented as

Where is the magnitude of the magnetic filed

Making B the subject

Substituting values

b.

explanation: