A resistance R placed in parallel with another resistance of 40π ,their equivalent resistance is 24π .the value of R is..............a)40π b)30π. c)60π
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Answer: The equivalent resistance of the group of resistances is R.
case 1:
a resistance r(say) is connected in parallel to the group, its new equivalent resistance R1 is
R
1
=
R+r
Rr
hence, R
1
<R.
case 2:
a resistance r is connected in series to the group, its new equivalent resistance R2 is
R
2
=R+r
hence, R
2
>R.
Explanation:
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