Question

what is the potential difference at A when AB is a straight line and a resistor 5 ohms and 1ampere current flow and v is zero at B​

Answer 1

In parallel resistances, the potential differences across them is same.

potential difference across PM

V=4×1=4volt(i.e,across4Ω)

Equivalent resistance of lower side arm,

R

eq

=1+

0.5+0.5

0.5×0.5

=1.25Ω

Let current I flow in lower branch,

So, 1.25I=4V

I=

1.25

4

=3.2A

therefore,

3.2A currents flows in 1Ω resistance,

hence potential difference between M and N is

V

′

=3.2×1=3.2volt

Hence,

option (B) is correct answer.

Answer 2

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Explanation:

➜In parallel resistances, the potential differences across them is same.

potential difference across PM

V=4×1=4volt(i.e,across4Ω)

Equivalent resistance of lower side arm,

R

eq

=1+

0.5+0.5

0.5×0.5

=1.25Ω

Let current I flow in lower branch,

So, 1.25I=4V

I=

1.25

4

=3.2A

therefore,

3.2A currents flows in 1Ω resistance,

hence potential difference between M and N is

V

′

=3.2×1=3.2volt

Hence,

option (B) is correct answer.