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Questions in physics

[Answered] 1. Name the physical quantity whose unit is Joule per coulomb? 2. ______ is a unit of energy? 3. Equal charge is given to spheres of different radii. How will the potential change? 4. For a linear dielectric, the ratio of dielectric polarization to the applied electric field is equal to? 5. What are the dimensions of electric polarization? 6. What is the electric field at a point very close to the surface of a charged conductor with surface charge density?

[Answered] 1. Assertion: A scalar has magnitude only. Reason: A scalar quantity is one that must be dimensionless. (1) Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion. (2) Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion. (3) Assertion is correct but Reason is incorrect. (4) Assertion is incorrect but Reason is correct. 2. Assertion: If a physical quantity is a vector, it must have direction. Reason: Current has a direction therefore it is a vector quantity. (1) Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion. (2) Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion. (3) Assertion is correct but Reason is incorrect.

[Answered] Identify which variable is plotted on each axis of a position vs time graph given the following data: | A | B | | --- | --- | | 0 | 0 | | 2 | 5 | | 4 | 10 | | 6 | 15 | | 8 | 20 | Column A represents the variable to be plotted on the $\square$ -axis. Column B represents the variable to be plotted on the $\square$ -axis. In a position vs time graph, time is always plotted on the $\square$ -axis.

[Answered] Which statement best defines energy? A. Energy is the force applied over a distance. B. Energy is the ability to do work. C. Energy is the rate at which work is done. D. Energy is the motion of objects.

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] For a stretched spring which is released and undergoing oscillations, which of the following statements is correct? A) Potential energy maximum at only right extreme position B) Potential energy maximum at only left extreme position C) Potential energy maximum at both the extreme positions D) Potential energy maximum at equilibrium position

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] If g - cm² - sec⁻¹ = x Js, then the number x is equal to: 1) 1 × 10⁻⁷ 2) 1 × 10⁷ 3) 1 × 10⁻⁵ 4) 1 × 10⁵

[Answered] Which of the following statements or expressions is most nearly associated with Kepler's First Law of Planetary Motion? A. [tex]P^2=A^3[/tex] B. Planetary orbits are in the shape of an ellipse. C. A planet moves fastest when it is farthest from the sun. D. The distance to a planet is proportional to the time it takes the planet to complete an orbit.

[Answered] The half-life of a particular radioactive substance is 1 minute. If you started with 375 grams of this substance, how much of it would remain after 5 minutes? Remaining Amount $= I (1-r)^{ t }$ [?] grams Round your answer to the nearest whole number.