# A current carrying loop kept in a uniform magnetic field is rotated about its axis

In a recent examination i encountered a question in which a current carrying coil was rotated clockwise about its own axis in a uniform magnetic field directed along the axis and out of the plane of the paper (refer the image provided below) and they asked the variation in tension in the wire.

I know that if the loop had been at rest than the tension would have been T=BiR. But in the question provided as the loop had been rotating in the clockwise direction, so i thought that the apparent current (ie. the current that interacts with the magnetic field) will increase.Its like if the loop is rotating at 1rev/sec the the magnitude of our so called current will double and the tension will be equal to 2BiR.

However in the solution provided they mentioned that the tension will increase but it will be the result of the accelerated mass of the wire. here a clip of the solution

What the were trying to say was that the tension does not increase due to the apparent change in current magnitude neither does the tension depend on the direction of rotation.

Why so?

Any help is appreciated. Thank You