Wheatstone bridge can be represented by following schematic diagram, a) What doe

Question

Wheatstone bridge can be represented by following schematic diagram, a) What does "balanced bridge" mean? b) Using schematic diagram of Wheatstone bridge write an equation for the NULL condition. c) Temperature has no effect on resistance. TRUE FALSE d) The equivalent resistance of four identical resistors mounted is series is larger than their equivalent value when combined in parallel. TRUE FALSE e) When the bridge is BALANCED. i R1 & R3 are connected in series TRUE FALSE ii. R2 & R4 are connected in series TRUE FALSE iii. R1 & R2 are connected in parallel TRUE FALSE iv. R3 & FM are connected in parallel TRUE FALSE

Explanation / Answer

a)

meaning of "balanced bridge" is,

the current through galvanometer is zero which is connected between the points

and

the current across R1 and R2 is same

and

the current across R3 and R4 is same

b)

R1/R2=R3/R4

c)

false,

because resistance depends on the temperature

d)

in series combination ===> Rnet=R1+R2+R3+R4

in parallel combination ===> 1/R'net=1/R1+1/R2+1/R3+1/R4

here,

Rnet is greaterthan the R'net

the correct option is true

e)

i) true

ii) true

iii) true

iv) true

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