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Refracting telescope: An astronomical telescope has an objec…

Refracting telescope: An astronomical telescope has an objective of diameter 20 cm with a focal length of 180 cm. The telescope is used with an eyepiece of focal length 30 mm. What is the angular magnification of this telescope?

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Thin lenses: A 4.0-cm tall object is placed 50.0 cm from a d…

Thin lenses: A 4.0-cm tall object is placed 50.0 cm from a diverging lens having a focal length of magnitude 25.0 cm. What are the nature and location of the image? The image is

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Spherical mirrors: A convex spherical mirror with a focal le…

Spherical mirrors: A convex spherical mirror with a focal length of magnitude 25 cm has a 4.0-cm tall flower placed 100 cm in front of it. What is the height of the image of the flower?

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Refracting telescope: The objective lens of a refracting tel…

Refracting telescope: The objective lens of a refracting telescope has a focal length of 60 cm and the eyepiece a focal length of 8.0 cm. What is the angular magnification of the telescope?

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Lenz’s law: In the figure, a straight wire carries a steady…

Lenz’s law: In the figure, a straight wire carries a steady current I perpendicular to the plane of the page. A bar is in contact with a pair of circular rails, and rotates about the straight wire. The direction of the induced current through the resistor R is

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Faraday’s law: A large magnetic flux change through a coil m…

Faraday’s law: A large magnetic flux change through a coil must induce a greater emf in the coil than a small flux change.

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Force on moving charges: A particle with charge -5.00 C init…

Force on moving charges: A particle with charge -5.00 C initially moves at

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Dielectrics: An air-filled capacitor stores a potential ener…

Dielectrics: An air-filled capacitor stores a potential energy of

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Internal battery resistance: Two light bulbs, B1 and B2, are…

Internal battery resistance: Two light bulbs, B1 and B2, are connected to a battery having appreciable internal resistance as shown in the figure. What happens to the brightness of bulb B1 when we close the switch S?

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Compound microscope: The distance between the object and the…

Compound microscope: The distance between the object and the eyepiece of a compound microscope is 18.0 cm. The focal length of its objective lens is 0.80 cm and the eyepiece has a focal length of 2.3 cm. The near-point distance of the person using the microscope is 25.0 cm. What is the total overall magnification of the microscope?

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