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What is magnetic dipole moment for a coil ? Write its SI unit and dimensional formula. |
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Answer» Solution :1. The product of current flowing from coil and area vector of that coil is known as magnetic dipole MOMENT. 2. If I current flow through coil and A be the area of this coil, then magnetic dipole moment is given by, `vecm=IvecA` 3. If N number of turns, then dipole moment is DEFINE as, `vecm=NIvecA` 4. SI unit of dipole moment is `Am^(2)` and its dimensional formula is given by `[M^(0)L^(2)T^(0)A^(1)]`. 5. `vectau=vecmxxvecB` `thereforetau=mBsintheta` `therefore" If "vecmandvecB` both are parallel `(theta=0^(@))` or anti parallel `(theta=180^(@))` to each other than torque will be ZERO and it is stable equilibrium. 6. If `theta=0^(@)`, then coil is in stable equilibrium. 7. When `theta=180^(@)` then it is in maximum unstable equilibrium because at any small rotation of thecoil produces a torque which brings it back to itsoriginal position. |
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