16,17,19,20 questions answers pls

1.	16,17,19,20 questions answers pls
Answer» ANSWER Explanation: 16. i) DIAMETER doubled ⇒radius doubled⇒Area quadrupled From volume conservation⇒length BECAME 1/4th R=ρl/A Thus RESISTANCE became 1/16th i.e.,6.25Ω II) l⇒2 l A⇒A/2 ∴R⇒4R=40Ω 19 l⇒l/2 two in parallel combination. i.e, R⇒R/4 20 i)series ii)parallel

Answer»

ANSWER Explanation:

16. i)

DIAMETER doubled ⇒radius doubled⇒Area quadrupled
From volume conservation⇒length BECAME 1/4th
R=ρl/A
Thus RESISTANCE became 1/16th

i.e.,6.25Ω

II)

l⇒2 l
A⇒A/2
∴R⇒4R=40Ω

l⇒l/2
two in parallel combination.

i.e, R⇒R/4

20 i)series

ii)parallel

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16,17,19,20 questions answers pls

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