Abattery can be modeled as a source of emf in series, with both a resistance of 10ωand an inductive reactance of 5

ω for a maximum power delivered to the load, the load should have a resistance of rl=10ωan inductive reactance of zero, and a capacitive reactance of 5

ω.with this load, is the circuit in resonance?

a) yes

b) no

c) it depends on the voltage provided by the battery.

with this load, what fraction of the average power, put out by the source of emf, is delivered to the load?

a) 0

b) 0.2

c) 0.5

d) 0.7

Explanation:

For circuit in resonance , inductive and capacitive reactance should be equal. Since in the given circuit ,  these two are not equal, the circuit is not in resonance. It does not depend upon voltage provided.

option b is correct.

With this load, the  fraction of the average power, put out by the source of emf,  delivered to the load can be calculated as follows

Power delivered to resistor will be 2/3 rd of total power delivered by source because resistance has value twice that of reactance of capacitor.  So the correct option is .7

option D ) is correct.

i think the answer is a, hope this : )

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form