Question

Answer question no. 21 urgent please
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Answer 1

neglect the 10 ohm resistor because current will not flow from the resistor. answer is d

Answer 2

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$\bold(A)\:\frac{3}{2}\:A$


step-by-step explanation:

$\bold{\red{Key\:concept:-}}$

We know that whenever a wire is in the parallel with a resistor or series resistors, the current doesn't flow through that resistor,

or simply we can say that,

whenever a wire is in parallel with a resistor, that specific resistor is ignored as current doesn't flows through it.

Now,

in the question,

the 10 Ω resistor is ignored.

(see the attachment)

the resultant circuit formed will be a series of 20Ω resistor and two voltage Sources of 20V and 30V.

(see the attachment)

now,

Total voltage, V' = (20+10)V = 30V

Resistance, r = 20Ω

Let, the current be 'i'

now,

we know that,

$v = ir$

$= > i = \frac{v}{r}$

here,

v = V' = 30V

r = 20Ω

Therefore,

$i = \frac{30}{20}$

$= > i = \frac{3}{2}$

Hence,

current flown through 20Ω resistor is $\frac{3}{2}\:A$