CBSE 12th Physics (Term 1) Paper 2021-22 | Current Electricity Question 19 | Physics

CBSE 12th Physics (Term 1) Paper 2021-22

MCQ (Single Correct Answer)

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A car battery is charged by a 12 V supply, and energy stored in it is 7.20 $$\times$$ 10⁵ J. The charge passed through the battery is -

6.0 $$\times$$ 10⁴ C

5.8 $$\times$$ 10³ J

8.64 $$\times$$ 10⁶ J

1.6 $$\times$$ 10⁵ C

CBSE 12th Physics (Term 1) Paper 2021-22

MCQ (Single Correct Answer)

+0.77

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If n, e, $$\tau$$ and m have their usual meanings, then the resistance of a wire of length l and cross-sectional area A is given by -

$${{n{e^2}A} \over {2m\tau l}}$$

$${{ml} \over {n{e^2}\tau A}}$$

$${{m\tau A} \over {n{e^2}l}}$$

$${{n{e^2}\tau A} \over {2ml}}$$

CBSE 12th Physics (Term 1) Paper 2021-22

MCQ (Single Correct Answer)

+0.77

-0

Two sources of equal emf are connected in series. This combination is, in turn connected to an external resistance R. The internal resistance of two sources are r₁ and r₂ (r₂ > r₁). If the potential difference across the source of internal resistance r₂ is zero, then R equals to -

$${{{r_1} + {r_2}} \over {{r_2} - {r_1}}}$$

$${r_2} - {r_1}$$

$${{{r_1}{r_2}} \over {{r_2} - {r_1}}}$$

$${{{r_1} + {r_2}} \over {{r_1}{r_2}}}$$

CBSE 12th Physics (Term 1) Paper 2021-22

MCQ (Single Correct Answer)

+0.77

-0

The equivalent resistance between A and B of the network shown in figure is

CBSE 12th Physics (Term 1) Paper 2021-22 Physics - Current Electricity Question 19 English