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+#+STARTUP: entitiespretty fold inlineimages
+#+LATEX_HEADER:  \usepackage{ dsfont } \usepackage{amsmath} \usepackage[a4paper,margin=1in,portrait]{geometry}
+#+LATEX: 
+#+OPTIONS: toc:nil
+
+* a
+** 26
+*** B from x_{dist} On axis of a current loop of radius a
+$B = \frac{\mu_0 I a^2}{2(x_{dist}_{}^2 + a^2)^{3/2}}$
+
+
+*** B on axis from magnetic dipole
+$B = \frac{\mu_0}{2 \pi} \frac{\mu}{x^3}$
+
+
+*** Net Torque on closed loop with area A at orientation \theta
+$\tau = I A B \text{sin}(\theta)$
+
+
+*** Field outside, inside any current distribution with line symmetry
+$B = \frac{\mu_0 I}{2 \pi r}$
+
+$B = \frac{\mu_0 I r_{inside}}{2 \pi R_{outside}^2}$
+
+*** Sheet with uniform current density J
+*** Solenoid with turns n per unit length
+
+** 27
+*** Flux through solenoid with n turns per unit length
+$\phi_B = BA = \mu_0 n I \pi R^2$
+
+
+*** Flux through rectangular loop with $l$ parallel to wire at distance $a$
+
+$\phi_B = \int B dA = \int_{a}^{a+w} \frac{\mu_0 I}{2 \pi r} l dr = \frac{\mu_0 I l}{2 \pi} \text{ln}(\frac{a+w}{a})$
+
+
+*** Induced current through circuit with bars at distance $l$ and moving bar velocity $v$
+$I = \frac{Blv} {r}$
+
+*** Flux through coil with $N$ turns turning at frequency $f$ in field $B$
+$\phi_B = N B \pi r^2 \text{cos}(2 \pi f t)$
+
+$E = - \frac{d \phi_B}{dt}$
+
+*** Inductance of a solenoid
+$L = \frac{\phi_B}{I} = \mu_0 n^2 A l$
+
+*** Electric field of a solenoid of radius $R$ at loop radius $r$ with $B = bt$
+$E = \frac{R^2 b}{2r}$
+