Which feature of the sun appears in cycles of about 11 years?

The Sun's magnetic field goes through a cycle, called the solar cycle. Every 11 years or so, the Sun's magnetic field completely flips. This means that the Sun's north and south poles switch places. Then it takes about another 11 years for the Sun's north and south poles to flip back again.

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Two cars collide, lock bumpers and move together after the collision.this collision is known as perfectly inelastic collision.