Question

In the circuit shown, the current through the 4 Ω resistor is 1 amp when the points P and M are connected to a d.c. voltage source. The potential difference between the points M and N is (a) 0.5 volt (b) 3.2 volt (c) 1.5 volt (d) 1.0 volt.

Answer 1

4ohm resistor=1amp

P&M are con

Explanation:

4ohm+3ohm+ 1ohm +1.0ohm =9ohm

1.5 v answer

Answer 2

Answer:

Option b)3.2 volt

Explanation:-

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

Potential differnces across PM

V=4×1=4volt(i.e across 4 ohm)

Equivalent resistance of lower side arm,

Req=1+0.5×0.5/0.5+0.5=1.25 ohm

Now, the circuit can be shown as:-

⬆️please see the attachment mate⬆️

Let,current "I" flow in lower branch,so

1.25I=4v

I=4/1.25=3.2A

Therefore,3.2 A current flows in 1 ohm resistance,

Hece potential difference between m and n is

V=3.2×1=3.2volt.

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