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(N/A) ElectrostaticsMagnetics$(1)$ Constant: $\frac{1}{4\pi\epsilon_{0}}$ $(\epsilon_{0} = 	ext{permittivity of vacuum})$$(1)$ Constant: $\frac{\mu_{

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(N/A) ElectrostaticsMagnetics$(1)$ Constant: $\frac{1}{4\pi\epsilon_{0}}$ $(\epsilon_{0} = 	ext{permittivity of vacuum})$$(1)$ Constant: $\frac{\mu_{0}}{4\pi}$ $(\mu_{0} = 	ext{permeability of vacuum})$$(2)$ Source: Electric charge $q$$(2)$ Source: Magnetic pole strength $q_{m}$$(3)$ Dipole moment: $\vec{p} = (2\vec{a})q$$(3)$ Dipole moment: $\vec{m} = (2\vec{l})q_{m}$$(4)$ Force: $F = \frac{1}{4\pi\epsilon_{0}} \frac{q_{1}q_{2}}{r^{2}}$$(4)$ Force: $F = \frac{\mu_{0}}{4\pi} \frac{q_{m1}q_{m2}}{r^{2}}$$(5)$ Axial field: $\vec{E} = \frac{2\vec{p}}{4\pi\epsilon_{0}r^{3}}$ $(r \gg l)$$(5)$ Axial field: $\vec{B} = \frac{\mu_{0}}{4\pi} \frac{2\vec{m}}{r^{3}}$ $(r \gg l)$$(6)$ Equatorial field: $\vec{E} = -\frac{\vec{p}}{4\pi\epsilon_{0}r^{3}}$ $(r \gg l)$$(6)$ Equatorial field: $\vec{B} = -\frac{\mu_{0}}{4\pi} \frac{\vec{m}}{r^{3}}$ $(r \gg l)$$(7)$ Torque: $\vec{	au} = \vec{p} 	imes \vec{E}$$(7)$ Torque: $\vec{	au} = \vec{m} 	imes \vec{B}$$(8)$ Potential energy: $U = -\vec{p} \cdot \vec{E}$$(8)$ Potential energy: $U = -\vec{m} \cdot \vec{B}$$(9)$ Work done: $W = pE(\cos	heta_{1} - \cos	heta_{2})$$(9)$ Work done: $W = mB(\cos	heta_{1} - \cos	heta_{2})$

Write the differences between electrostatics and magnetics.

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Electrostatics	Magnetics
$(1)$ Constant: $\frac{1}{4\pi\epsilon_{0}}$ $(\epsilon_{0} = \text{permittivity of vacuum})$	$(1)$ Constant: $\frac{\mu_{0}}{4\pi}$ $(\mu_{0} = \text{permeability of vacuum})$
$(2)$ Source: Electric charge $q$	$(2)$ Source: Magnetic pole strength $q_{m}$
$(3)$ Dipole moment: $\vec{p} = (2\vec{a})q$	$(3)$ Dipole moment: $\vec{m} = (2\vec{l})q_{m}$
$(4)$ Force: $F = \frac{1}{4\pi\epsilon_{0}} \frac{q_{1}q_{2}}{r^{2}}$	$(4)$ Force: $F = \frac{\mu_{0}}{4\pi} \frac{q_{m1}q_{m2}}{r^{2}}$
$(5)$ Axial field: $\vec{E} = \frac{2\vec{p}}{4\pi\epsilon_{0}r^{3}}$ $(r \gg l)$	$(5)$ Axial field: $\vec{B} = \frac{\mu_{0}}{4\pi} \frac{2\vec{m}}{r^{3}}$ $(r \gg l)$
$(6)$ Equatorial field: $\vec{E} = -\frac{\vec{p}}{4\pi\epsilon_{0}r^{3}}$ $(r \gg l)$	$(6)$ Equatorial field: $\vec{B} = -\frac{\mu_{0}}{4\pi} \frac{\vec{m}}{r^{3}}$ $(r \gg l)$
$(7)$ Torque: $\vec{\tau} = \vec{p} \times \vec{E}$	$(7)$ Torque: $\vec{\tau} = \vec{m} \times \vec{B}$
$(8)$ Potential energy: $U = -\vec{p} \cdot \vec{E}$	$(8)$ Potential energy: $U = -\vec{m} \cdot \vec{B}$
$(9)$ Work done: $W = pE(\cos\theta_{1} - \cos\theta_{2})$	$(9)$ Work done: $W = mB(\cos\theta_{1} - \cos\theta_{2})$