Do I need Nvidia PhysX if I have an AMD GPU?

Nope. The PhysX software won't run on AMD GPUs or even on CPUs, just on nVidia GPUs. It's supposed to offload some of the CPU's workload onto a secondary GPU (or a PPU, if you have one of the really old Ageia cards)>. Like WillJackman said, it was probably installed by a game (i.e. Unreal Engine v3.

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Subsequently, does apex legends use physx?

Game designers use PhysX and APEX technologies for collision detection and simulation of rigid bodies, clothing, fluids, particle systems and more across a wide range of platforms, including desktop PCs, game consoles, and mobile and handheld devices. Is PhysX any good? It's the most stable and efficient of all the physics engines that I've used. The documentation is thorough and the developers are knowledgeable and responsive to any issues. Review collected by and hosted on G2.com.

Should I set NVIDIA as preferred graphics processor?

This does have a tendency to go wrong occasionally so for the most consistent performance, and to really be sure your expensive graphics card is doing its job, setting it as the default graphics provider is usually the best course of action. Is high performance NVIDIA processor good? Nvidia Graphics Processor provides higher performance with shorter battery life when you're running your device on battery power. When your laptop is plugged in, you obviously don't have to worry about the battery.

How do I switch from Intel graphics to NVIDIA?

Here's the steps on how to set it to default. Open the "Nvidia Control Panel". Select "Manage 3D Settings" under 3D Settings. Click on the "Program Settings" tab and select the program you want to choose a graphics card for from the drop down list. Now select "preferred graphics processor" in the drop down list.