CBSE Class 10 Answered

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Asked by pankajchahal2580 | 16 Jan, 2023, 07:23: PM

Expert Answer

Qn.(6)

Equivalenet resistance 1Ω is less than all three given resistances 6Ω , 3Ω and 2Ω .

Hence all resistors should be connected in parallel.

If R₁ , R₂ , R₃ are connected parallel , then equivalenet resistance is given as

begin mathsize 14px style R subscript e q end subscript space equals space fraction numerator R subscript 1 space R subscript 2 space R subscript 3 over denominator R subscript 1 space R subscript 2 space plus space R subscript 2 R subscript 3 plus R subscript 3 R subscript 1 end fraction end style

Using above expression, we get equivalenet resistance of 6Ω , 3Ω and 2Ω connected in parallel as

begin mathsize 14px style R subscript e q end subscript space equals space fraction numerator 6 space cross times 3 space cross times 2 over denominator left parenthesis space 6 space cross times space 3 space right parenthesis space plus space left parenthesis 3 cross times 2 right parenthesis plus left parenthesis 2 cross times 6 right parenthesis end fraction space equals space 1 space capital omega end style

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Qn. (8)

Object is placed at left side of lens between main focus point F and optical center O .

Image is formed at same side where object is placed.

Image is virtual , magnified and erect.

Answered by Thiyagarajan K | 16 Jan, 2023, 08:16: PM