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Physics, Chemistry and Biology: Post your doubts here!

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Awesome12

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exploded diper said:
View attachment 38869
since x and y are parallel there resistance is less.........so when y is removed the resistance across x increeases..and so does the voltage...as x and z are arranged in series so voltage across z decreases so it becomes less brighter......brightness depends on voltage
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In a voltage circuit, the voltage remains the same. Thus when we add or remove the lamp, the total voltage at X will still remain the same. As a result, Z will light with the same brightness
 
3abder7man

3abder7man

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Awesome12 said:
In a voltage circuit, the voltage remains the same. Thus when we add or remove the lamp, the total voltage at X will still remain the same. As a result, Z will light with the same brightness
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Nope. Assume each bulb has a resistance of 2 ohms, so before Y is removed, X and Y have a combined resistance of (1/2)+(1/2) = 1 ohm
while after Y is removed X would have a resistance of 2 ohms, and so a higher voltage. Consequently, the voltage across Z will decrease and it gets dimmer
 
eureka!

eureka!

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Phoenix Blood said:
You know what? - this idiocy had come in the paper :) I'd seen the answer in the MS, but i dunno... Do we have to KNOW this or DERIVE it?
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Why should we be expected to know it? I mean, germanium oxide is pretty obscure. You've just gotta bank on that 'similar to SiO2' statement. Plus, the formula's the same too.
 
Phoenix Blood

Phoenix Blood

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eureka! said:
Why should we be expected to know it? I mean, germanium oxide is pretty obscure. You've just gotta bank on that 'similar to SiO2' statement. Plus, the formula's the same too.
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That's what i mean- this SiO2. Do we have to know that it's surrounded by six oxygen atoms, and the oxygen atoms are surrounded by two of it? Well, now i know it... but-
Lol. How can it be that it's surrounded by the six O2s and simultaneously two SiO2s surround this O2? :sick:
Draw and show zara :D
 
eureka!

eureka!

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Phoenix Blood said:
That's what i mean- this SiO2. Do we have to know that it's surrounded by six oxygen atoms, and the oxygen atoms are surrounded by two of it? Well, now i know it... but-
Lol. How can it be that it's surrounded by the six O2s and simultaneously two SiO2s surround this O2? :sick:
Draw and show zara :D
Click to expand...
Arey!! Who said two whole SiO2s have to surround anything? Read it again man! And yes, we have to know this.
 
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