Auroras occur at of a planet. the equator the north magnetic pole only the south magnetic pole only both magnetic poles

The answer is - both magnetic poles

In the earth's southern magnetic pole, auroras are known as aurora austalis  or southern lights while in the northern magnetic pole they are known as aurora borealis or northern lights.

They are caused by charged particles borne in solar winds that are escaping from the sun. As they approach the earth,  the winds distort the earth's magnetic field which allows some particles to enter the earth's atmosphere, where they excite the gases and make them glow with spectacular display of colors.

concave lenses are used here. they spread the light out before it reaches the convex lens in the eye, therefore letting the image focus directly on the retina. hyperopia is known to you probably as farsightedness.

a small object of mass 3.66 g and charge -17.6 µc is suspended motionless above the ground when immersed in a uniform electric field perpendicular to the ground. what are the magnitude and direction of the electric field?