For rogue waves to form so often, they must follow a non-linear system, instead of the linear constructive interference system scientists once thought was to explain these waves. What is does it mean to be a non-linear equation?

and 1and 1

the closer the planet is to the sun, the larger the gravity

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.