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Some pinball machines have electromagnets under the playing surface that will ocassionally activate, but those usually don't specifically direct the ball into the outholes. Magna save on say Black Knight, is there for the player's benefit.

Some tables have an electromagnet under portions of loops to hold and release balls for specific modes, for example on Twilight Zone.

Other tables have electromagnets in more open parts of the playfield like Stern's BatMan with the electromagnet on a crane, and as I recall, SpiderMan has an electromagnet feature. There's some that use an electromagnet to get randomish motion near the flippers, but they usually pull the ball upwards, not downwards.