C++ :: Static Variables In Classes

If I have a static variable in a class e.g. a pointer to another class like this: (B is another class)

class A {
public:
static B* cB;
};

Then I set that variable and create multiple instances of class A like this:

A::cB = new B;
As = new A[Number];

Then will the value of cB be the same across all instances?

I cannot pass the class pointer in the constructor as I need to create an array of instances. I tried this method but I get linker error.... unresolved external.