Question

Urgent help need . for physics

Answer 1

Answer:

$\boxed{ \red{ \bold{ \huge{1st \: question}}}}$

In order to find out the equivalent resistance, we will simply observe the resistances which are in series or in parallel combinations and then calculate.

1) 3 ohm and 12 ohm are in series.

2) 2 ohm and 18 ohm are in series .

And this combination is in parallel with each other.

So total resistance in the upper part of square

= 3 + 12 = 15 ohm

Similarly , total resistance in lower part of square

= 2 + 18 = 20 ohm

Net resistance in whole square :

$r = \dfrac{15 \times 20}{15 + 20} = \dfrac{60}{7} ohm$

This resistance is in series with 6 ohm :

So , let equivalent resistance be R eq.

$R \: eq. = \dfrac{60}{7} + 6$

$= > R \: eq. = \dfrac{60 + 42}{7}$

$\boxed{ \blue{ = > R \: eq. = \dfrac{102}{7} \: ohm }}$

$\boxed{ \red{ \bold{ \huge{2nd \: question}}}}$

In this question, first try to draw tge simplified circuit and then solve the question :

Refer to the attached photo to understand better

We can see that the Equivalent Resistance of the circuit is 9.6 ohm

So current flowing will be :

$\boxed{ \green{ \bold{i = \dfrac{v}{r} = \dfrac{10}{9.6} = 1.04 \: amp}}}$

Answer 2

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Figure 1 :

The above figure consists of a parall

Net Resistance = $\dfrac{60}{7} + 6 = \dfrac{102}{7}$

Hence Option D is Correct.

Figure 2 :

Net Resistance = 9.6 ohm.

$</p><p>\tt{\purple{V = \dfrac{I}{R} = \dfrac{10}{9.6} = 1.04 \: A }}$