72:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"Magnetic force on a charge moving along B?"}]]}] 73:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"Zero."}]]}] 74:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"Why does a magnetic force do no work?"}]]}] 75:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"It is always perpendicular to the velocity."}]]}] 76:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"Radius and period of circular motion in B?"}]]}] ad:T412,

r = mv/qB

ae:T43d,

T = 2\pi m/qB

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v = E/B

"}}],"."]}]]}] 7c:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"Biot–Savart law?"}]]}] af:T1039,

dB = \dfrac{\mu_0}{4\pi}\dfrac{I\,dl\sin\theta}{r^2}

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4\pi \times 10^{-7}

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^{-1}

"}}],"."]}]]}] 80:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"Field on the axis of a loop?"}]]}] b1:Td14,

\mu_0 IR^2/2(R^2+x^2)^{3/2}

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\mu_0 NI/2R

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\oint \vec B\cdot d\vec l = \mu_0 I_\text{enc}

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\mu_0 I/2\pi r

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\mu_0 nI

8b:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":[["$","span","code-0",{"className":"SmxAaG_mathInline","data-math":"inline","tabIndex":"$undefined","dangerouslySetInnerHTML":{"__html":"$b5"}}],", uniform, along the axis."]}]]}] 8c:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"Field just outside a long solenoid (middle)?"}]]}] 8d:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"Nearly zero."}]]}] 8e:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"Force on a straight wire in B?"}]]}] b6:T11d8,

\vec F = I\vec l \times \vec B

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\mu_0 I_1I_2/2\pi d

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2 \times 10^{-7}

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^{-1}

"}}]," between two long parallel wires 1 m apart in vacuum."]}]]}] 96:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"Torque on a coil in B?"}]]}] ba:T4ce,

\tau = NIAB\sin\theta

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m = NIA

"}}]," (A m²), along the right-hand normal."]}]]}] 9a:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"Coil orientation for maximum torque?"}]]}] 9b:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"Plane of the coil parallel to B (normal perpendicular to B)."}]]}] 9c:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"Net force on a current loop in a uniform field?"}]]}] 9d:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"Zero (only a torque)."}]]}] 9e:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"Why a radial field in a galvanometer?"}]]}] 9f:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"Torque NIAB at every angle, so deflection ∝ current (linear scale)."}]]}] a0:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"Current sensitivity of a galvanometer?"}]]}] a1:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":[["$","span","code-0",{"className":"SmxAaG_mathInline","data-math":"inline","tabIndex":"$undefined","dangerouslySetInnerHTML":{"__html":"

NAB/k

"}}],"."]}]]}] a2:["$","div",null,{"className":"SmxAaG_md","lang":"$undefined","children":[["$","p","p-0",{"children":"Converting a galvanometer to an ammeter?"}]]}] bb:Ta33,

S = I_gG/(I - I_g)

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R = V/I_g - G

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