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Solve the following problem.
Three resistors 10 Ω, 20 Ω, and 30 Ω are connected in series combinations.
- Find the equivalent resistance of series combination.
- When this series combination is connected to 12V supply, by neglecting the value of internal resistance, obtain potential difference across each resistor.
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Solve the following problem.
Two resistors 1 kΩ and 2 kΩ are connected in parallel combination.
- Find equivalent resistance of parallel combination
- When this parallel combination is connected to 9 V supply, by neglecting internal resistance calculate current through each resistor.
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Solve the following problem.
Find the value of resistance for the following colour code.
Blue Green Red Gold
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Solve the following problem.
Find the value of resistance for the following colour code.
Brown Black Red Silver
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Solve the following problem.
Find the value of resistance for the following colour code.
Red Red Orange Gold
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Solve the following problem.
Find the value of resistance for the following colour code.
Orange White Red Gold
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Find the value of resistance for the following colour code.
Yellow Violet Brown Silver
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Solve the following problem.
Find the colour code for the following value of resistor having tolerance ± 10%
330 Ω
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Solve the following problem.
Find the colour code for the following value of resistor having tolerance ± 10%
100 Ω
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Solve the following problem.
Find the colour code for the following value of resistor having tolerance ± 10%
47 kΩ
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Solve the following problem.
Find the colour code for the following value of resistor having tolerance ± 10%
160 Ω
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Solve the following problem.
Find the colour code for the following value of resistor having tolerance ± 10%
1 KΩ
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Choose the correct option.
Current through a reverse-biased p-n junction increases abruptly at:
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Answer in detail.
Discuss the effect of external voltage on the width of depletion region of a p-n junction.
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Choose the correct option.
A student uses spectacles of number -2 for seeing distant objects. Commonly used lenses for her/his spectacles are
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Consider the following statements regarding a simple microscope
(P) It allows us to keep the object within the least distance of distant vision.
(Q) Image appears to be biggest if the object is at the focus.
(R) It is simply a convex lens.
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Answer the following question.
A spherical surface separates two transparent media. Derive an expression that relates object and image distances with the radius of curvature for a point object. Clearly state the assumptions, if any.
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Answer the following question.
Derive lens makers’ equation. Why is it called so? Under which conditions focal length f and radii of curvature R are numerically equal for a lens?
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Solve Numerical example.
A convex lens held some distance above a 6 cm long pencil produces its image of SOME size. On shifting the lens by a distance equal to its focal length, it again produces the image of the SAME size as earlier. Determine the image size.
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A point object is kept 10 cm away from one of the surfaces of a thick double convex lens of refractive index 1.5 and radii of curvature 10 cm and 8 cm. Central thickness of the lens is 2 cm. Determine location of the final image considering paraxial rays only.
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