The concept of entropy is related to the tendency of nature to become disorderly with the increase in internal energy. Defining entropy as the logarithmic value of the number of possible microstates of any thermodynamic system also shows entropy is related to matter's physical and thermodynamic properties.
You will not be attracted towards the phone with greater force. However, if you enter into your phone black hole, you need to reach speed c to get out of this since c is the escape velocity of that black hole.
One relation I can think of is-
[math]c^2=\frac{1}{e_0 \mu_0}[/math]
where [math]c[/math] is speed of light,[math]e_0[/math] is vacuum permittivity and [math]\mu_0[/math] is the vacuum permeability.
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To understand physics you need to have a good hold over mathematics. As you asked how maths helps, I will tell you that maths is basically required to interpret the theories and hypotheses of physics. Even for the simple definition of pressure, we like it show it as P=F/A.
Since Fe has high magnetic permeability, most of the magnetic flux flows through the iron piece. But there must be very little amount of flux around. So the wire should experience a bit of force which is very less as compared to the previous situation.
All elements like to form chemical bonds. So, they lose electrons or gain electrons to form anions and cations respectively. They start exerting an electrostatic force of attraction and pull each other together. It's the most simple bond.
Another one is the covalent bond which involves sharing of electrons between atoms.
Then there is the coordinate covalent bond, which involves partial donation from only one atom.
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