7. A light circular wire suspended by a thin silk thread in a uniform magnetic field car- ries a current in the direction shown in Fig- ure 20.53. The magnetic field is perpendicu- lar to the plane of the paper, and the wire is held at rest in that plane. If the wire is sud- denly released so that it is free to rotate, A. It will rotate so that point a goes into the X X A FIGURE 20.53 рaper. B. It will rotate so that point a goes out of Multiple-choice the paper. problem 7. C. It will not rotate.

Q: 6.0 m/s •D 3.0 m •B 2.0 kg

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Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.