what resistance must be placed in parallel with 20 ohm to make the combined resistance 15 ohm ?
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parallel combination ---
let the resistance of d required resistor be x ohm.
now ,
1/20 + 1/x = 15
1/x = 15 - 1/20
1/x = 299/20
x = 20/299
hence d required resistance is 20/299ohms
let the resistance of d required resistor be x ohm.
now ,
1/20 + 1/x = 15
1/x = 15 - 1/20
1/x = 299/20
x = 20/299
hence d required resistance is 20/299ohms
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