( RLC circuit ) The circuit in the figure consists of a resistor ( R ohms), an inductor ( L henrys), a capacitor ( C farads), and an initial voltage source. Let b = R /(2 L ), and suppose R , L , and C have been selected so that b also equals 1 / LC . (This is done, for instance, when the circuit is used in a voltmeter.) Let v ( t ) be the voltage (in volts) at time t , measured across the capacitor. It can be shown that v is in the null space H of the linear transformation that maps v ( t ) into Lv" ( t ) + Rv' ( t ) + (l/ C ) v ( t ), and H consists of all functions of the form v ( t ) = e − bt ( c 1 + c 2 t ). Find a basis for H .
( RLC circuit ) The circuit in the figure consists of a resistor ( R ohms), an inductor ( L henrys), a capacitor ( C farads), and an initial voltage source. Let b = R /(2 L ), and suppose R , L , and C have been selected so that b also equals 1 / LC . (This is done, for instance, when the circuit is used in a voltmeter.) Let v ( t ) be the voltage (in volts) at time t , measured across the capacitor. It can be shown that v is in the null space H of the linear transformation that maps v ( t ) into Lv" ( t ) + Rv' ( t ) + (l/ C ) v ( t ), and H consists of all functions of the form v ( t ) = e − bt ( c 1 + c 2 t ). Find a basis for H .
Solution Summary: The author explains that the vector space H consists of all functions of the form v(t)=e-bt
(RLC circuit) The circuit in the figure consists of a resistor (R ohms), an inductor (L henrys), a capacitor (C farads), and an initial voltage source. Let b = R/(2L), and suppose R, L, and C have been selected so that b also equals
1
/
LC
. (This is done, for instance, when the circuit is used in a voltmeter.) Let v(t) be the voltage (in volts) at time t, measured across the capacitor. It can be shown that v is in the null space H of the linear transformation that maps v(t) into Lv"(t) + Rv'(t) + (l/C)v(t), and H consists of all functions of the form v(t) = e−bt(c1 + c2t). Find a basis for H.
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