Electric Resistance and Simple Circuits | Physics JEE previous year questions with Solutions

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Q 21 :

In the given circuit, the current $(I)$ through the battery will be [2023]

[IMAGE 187]

1.5 A
1 A
2.5 A
2 A

(1)

$In the circuit D_{1} and D_{3} are forward biased and D_{2} is reverse biased.$

[IMAGE 188]

$∴$ $I = \frac{10}{20 / 3} = \frac{10 \times 3}{20} = \frac{3}{2} A = 1.5 A$

Q 22 :

In the given circuit, the equivalent resistance between the terminal A and B is ________ $Ω$ . [2023]

[IMAGE 189]

0%

(10)

[IMAGE 190]

$R_{A B} = 3 + 1 + 6 = 10 Ω$

Q 23 :

If the potential difference between $B$ and $D$ is zero, the value of $x$ is $\frac{1}{n} Ω$ . The value of $n$ is ______. [2023]

[IMAGE 191]

0%

(2)

$\frac{2}{3} = \frac{\frac{x}{x + 1}}{x}$

$\Rightarrow \frac{2}{3} = \frac{1}{x + 1}$

$\Rightarrow x = 0.5 = \frac{1}{2}$

$\Rightarrow n = 2$

Q 24 :

10 resistors each of resistance 10 $Ω$ can be connected in such a way as to get maximum and minimum equivalent resistance. The ratio of maximum and minimum equivalent resistance will be ________. [2023]

0%

(100)

Maximum resistance occurs

When all the resistors are connected in series combination

$∴$ $R_{\max} = 10 R$

$Here R = 10 Ω$

Minimum resistance occurs

When all the resistances are connected in parallel combination

$R_{\min} = \frac{R}{10}$

$∴$ $\frac{R_{\max}}{R_{\min}} = 100$

Topic Question Set

Q 21 :

In the given circuit, the current $(I)$ through the battery will be [2023]

[IMAGE 187]

Q 22 :

In the given circuit, the equivalent resistance between the terminal A and B is ________ $Ω$ . [2023]

[IMAGE 189]

0%

Q 23 :

If the potential difference between $B$ and $D$ is zero, the value of $x$ is $\frac{1}{n} Ω$ . The value of $n$ is ______. [2023]

[IMAGE 191]

0%

Q 24 :

10 resistors each of resistance 10 $Ω$ can be connected in such a way as to get maximum and minimum equivalent resistance. The ratio of maximum and minimum equivalent resistance will be ________. [2023]

0%

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