Internal torque of the coil, while operation is _____________

1.	Internal torque of the coil, while operation is _____________
A.	M.r
B.	M.r<sup>2</sup>
C.	M.r<sup>2</sup>.x‚Äö√Ñ√∂‚àö√ë‚àö¬•‚Äö√Ñ√∂‚àö√ë‚àö¬•(t)
D.	M.r.x(t)
Answer» E.

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