It is desired to make a `20Omega` coil of wire, which has a zero thermal coefficient of resistance. To do this, a carbon resistor of resistance `R_1` is placed in series with an iron resistor of resistance `R_2`. The proportions of iron and carbon are so chosen that `R_1 +R_2 = 20Omega` for all temperatures near `20^@C.` How long are `R_1 and R_2`? `alpha_(carbon) =- 0.5xx10^(-3).^@C^(-1), alpha_(iron) = 5xx10^(-3) .^@C(-1)`

It is desired to make a 20Omega coil of wire, which has a zero thermal coefficient of resistance. To do this, a carbon resitor fo resistane R_1 is placed in series with an iron resistor of resistance R_2 the proportions of iron and carbon are so chosen that R_1 +R_2 = 20Omega for all temperatures near 20^@C. How long are R_1 and R_2 ? alpha_(carbon) =- 0.5xx10^(-3).^@C^(-1), alpha_(iron) = 5xx10^(-3) .^@C(-1)

It is desired to make a 20.0Omega coil of wire whose temperature coefficient of resistance is zero. To do this, a carbon resistor of resistance R_(1) is placed in series with an iron resistor of resistance R_(2) . The proportion of iron and carbon are so chosen that R_(1) +R_(2)= 20 Omega for all temperatures near 20^@C . Find the values of R_(1) and R_(2) . Temperature coefficient of resistance for carbon, alpha_(C)= - 0.5 xx 10^(-3)//^(@)C and that of iron is alpha_(Fe) =5 xx 10^(-3)//^(@)C .

If resistors of resistance R_(1) and R_(2) are connected in parallel,then resultant resistance is "

Two resistors of resistance R_1 and R_2 having R_1>R_2 are connected in parallel. For equivalent resistance R, the correct statement is

A resistor of resistance R is connected to a cell internal resistance 5 Omega . The value of R is varied from 1 Omega to 5 Omega . The power consumed by R

The temperature coefficient of resistance of conductor varies as alpha(T) = 3T^2 +2T. If R_0 is resistance at T = 0and R is resistance at T, then

When two resistors of resistances R_1 and R_2 are connected in parallel, the net resistance is 3 Omega . When connected in series, its value is 16 Omega . Calculate the values of R_1 and R_2 .

The resistors of resistances R_(1)=100pm3" ohm and R"_(2)=200pm 4ohm are connected in series. The equivalent resistance of the series combination is

Two resistors of resistance R_(1) and R_(2) having R_(1) gt R_(2) are connected in parallel. For equivalent resistance R, the correct statement is