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Electric Current and CircuitsQuestion and Answers: Page 1

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How to find relative charge of an proton or electron?

$${How}\:{to}\:{find}\:{relative}\:{charge}\:{of}\:{an} \\ $$$${proton}\:{or}\:{electron}? \\ $$

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what does relative charge mean?

$${what}\:{does}\:{relative}\:{charge}\:{mean}? \\ $$

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why we use the current as conventional in a circuit?

$${why}\:{we}\:{use}\:{the}\:{current}\:{as}\:{conventional}\:{in} \\ $$$${a}\:{circuit}? \\ $$

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why can′t birds catch by the AC current?

$${why}\:{can}'{t}\:{birds}\:{catch}\:{by}\:{the}\:{AC}\:{current}? \\ $$

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Two Spheres are charged by +3μC and −3μC respectively.The charges are equally distributed in the serface of the sphere .The distance between two spheres is 100cm . Now if we Connect these two spheres with a conducting wire , a)What will be the potential difference between two ends of that wire? b)Find the amount of current flow in the wire if the resistance of that wire is 100μΩ .

$$\: \\ $$$$\:\:\mathrm{Two}\:\mathrm{Spheres}\:\mathrm{are}\:\mathrm{charged}\:\mathrm{by}\:+\mathrm{3}\mu\mathrm{C}\:\mathrm{and} \\ $$$$−\mathrm{3}\mu\mathrm{C}\:\mathrm{respectively}.\mathrm{The}\:\mathrm{charges}\:\mathrm{are}\: \\ $$$$\:\:\mathrm{equally}\:\mathrm{distributed}\:\mathrm{in}\:\mathrm{the}\:\mathrm{serface}\:\mathrm{of}\:\mathrm{the}\: \\ $$$$\:\:\mathrm{sphere}\:.\mathrm{The}\:\mathrm{distance}\:\mathrm{between}\:\mathrm{two}\: \\ $$$$\:\:\mathrm{spheres}\:\mathrm{is}\:\mathrm{100cm}\:.\:\mathrm{Now}\:\mathrm{if}\:\mathrm{we}\:\mathrm{Connect} \\ $$$$\:\:\mathrm{these}\:\mathrm{two}\:\mathrm{spheres}\:\mathrm{with}\:\mathrm{a}\:\mathrm{conducting}\: \\ $$$$\:\:\mathrm{wire}\:, \\ $$$$\left.\:\:\mathrm{a}\right)\mathrm{What}\:\mathrm{will}\:\mathrm{be}\:\mathrm{the}\:\mathrm{potential}\:\mathrm{difference} \\ $$$$\:\mathrm{between}\:\mathrm{two}\:\mathrm{ends}\:\mathrm{of}\:\mathrm{that}\:\mathrm{wire}? \\ $$$$\left.\:\mathrm{b}\right)\mathrm{Find}\:\mathrm{the}\:\mathrm{amount}\:\mathrm{of}\:\mathrm{current}\:\mathrm{flow}\:\mathrm{in} \\ $$$$\:\mathrm{the}\:\mathrm{wire}\:\mathrm{if}\:\mathrm{the}\:\mathrm{resistance}\:\mathrm{of}\:\mathrm{that}\:\mathrm{wire}\: \\ $$$$\:\mathrm{is}\:\mathrm{100}\mu\Omega\:. \\ $$$$\: \\ $$

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Given i(t)=25cos(ωt) ; u(t)=50[1+(ωt)^(2/(2!)) +(ωt)^(4/(4!)) +(ωt)^(6/(6!)) +...] . (1/T)∫_0 ^T u(t)×i(t)dt=??? choose the correct answer: a. 225 b. 425 c. 625 d. an other one

$${Given}\:{i}\left({t}\right)=\mathrm{25}{cos}\left(\omega{t}\right)\:; \\ $$$${u}\left({t}\right)=\mathrm{50}\left[\mathrm{1}+\left(\omega{t}\right)^{\frac{\mathrm{2}}{\mathrm{2}!}} +\left(\omega{t}\right)^{\frac{\mathrm{4}}{\mathrm{4}!}} +\left(\omega{t}\right)^{\frac{\mathrm{6}}{\mathrm{6}!}} +...\right]\:. \\ $$$$\frac{\mathrm{1}}{{T}}\underset{\mathrm{0}} {\overset{{T}} {\int}}{u}\left({t}\right)×{i}\left({t}\right){dt}=??? \\ $$$${choose}\:{the}\:{correct}\:{answer}: \\ $$$${a}.\:\mathrm{225} \\ $$$${b}.\:\mathrm{425} \\ $$$${c}.\:\mathrm{625} \\ $$$${d}.\:{an}\:{other}\:{one} \\ $$

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A toroid core has N=1200 turns, length L=80cm,cross-section area A=60cm^2 ,current I=1.5A. Compute B and H.Assume an empty core

$$\mathrm{A}\:\mathrm{toroid}\:\mathrm{core}\:\mathrm{has}\:\mathrm{N}=\mathrm{1200}\:\mathrm{turns}, \\ $$$$\mathrm{length}\:\mathrm{L}=\mathrm{80cm},\mathrm{cross}-\mathrm{section}\:\mathrm{area} \\ $$$$\mathrm{A}=\mathrm{60cm}^{\mathrm{2}} ,\mathrm{current}\:\mathrm{I}=\mathrm{1}.\mathrm{5A}. \\ $$$$\:\:\mathrm{Compute}\:\mathrm{B}\:\mathrm{and}\:\mathrm{H}.\mathrm{Assume}\:\mathrm{an} \\ $$$$\:\mathrm{empty}\:\mathrm{core} \\ $$

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In an RLC series circuit, R=1kilo ohms,L=0.2H,C=1 F. If the voltage source is given by: (V=150 sin 377t )V. What is the peak current delivered by the source?

$$\mathrm{In}\:\mathrm{an}\:\mathrm{R}{LC}\:\mathrm{series}\:\mathrm{circuit}, \\ $$$$\mathrm{R}=\mathrm{1kilo}\:\mathrm{ohms},\mathrm{L}=\mathrm{0}.\mathrm{2H},\mathrm{C}=\mathrm{1} \mathrm{F}. \\ $$$$\mathrm{If}\:\mathrm{the}\:\mathrm{voltage}\:\mathrm{source}\:\mathrm{is}\:\mathrm{given}\:\mathrm{by}: \\ $$$$\left(\mathrm{V}=\mathrm{150}\:\mathrm{sin}\:\mathrm{377t}\:\right)\mathrm{V}.\:\mathrm{What}\:\mathrm{is}\:\mathrm{the} \\ $$$$\mathrm{peak}\:\mathrm{current}\:\mathrm{delivered}\:\mathrm{by}\:\mathrm{the}\: \\ $$$$\mathrm{source}? \\ $$

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Why is the ammeter always connected in series and the voltmeter in parallel?

$${Why}\:{is}\:{the}\:{ammeter}\:{always}\:{connected}\:{in}\:{series} \\ $$$${and}\:{the}\:{voltmeter}\:{in}\:{parallel}? \\ $$

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