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An ac source of angular frequency ω is fed across a resistor R and a capacitor C in series. The current registered is I . If now the frequency of the source is changed to ω/3 (but maintaining the same voltage), the current in the circuit is found to be halved. The ratio of the reactance to resistance at the original frequency ω is given as √ x/5 . Find x .

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An ac source of angular frequency ω is fed across a resistor R and a capacitor C in series. The current registered is I . If now the frequency of the source is changed to ω/3 (but maintaining the same voltage), the current in the circuit is found to be halved. The ratio of the reactance to resistance at the original frequency ω is given as √ x/5 . Find x .

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A stone is dropped from a height h. It hits the ground with a certain momentum p. If the stone is dropped from a height 100% more than the previous height, the momentum when it hits the ground will change by A) 68% B) 41% C) 200% D) 100%

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A stone is dropped from a height h. It hits the ground with a certain momentum p. If the stone is dropped from a height 100% more than the previous height, the momentum when it hits the ground will change by A) 68% B) 41% C) 200% D) 100%

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Which of the following is not equal to watt? (a) joule/second (b) ampere x volt (c) (ampere)2 x ohm (d)ampere/volt​

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Which of the following is not equal to watt? (a) joule/second (b) ampere x volt (c) (ampere)2 x ohm (d)ampere/volt​

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A particle of charge q and mass m enters normally (at point P) in a region of the magnetic field with speed v. It comes out normally from Q after time T as shown in fig. The magnetic field Bis present only in the region of radius R and is uniform. Initial and final velocities are along the radial direction and they are perpendicular to each other. For this to happen, which of the following expression(s) is/are correct?

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A particle of charge q and mass m enters normally (at point P) in a region of the magnetic field with speed v. It comes out normally from Q after time T as shown in fig. The magnetic field Bis present only in the region of radius R and is uniform. Initial and final velocities are along the radial direction and they are perpendicular to each other. For this to happen, which of the following expression(s) is/are correct?

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Cp and Cv are specific heats at constant pressure and constant volume, respectively. It is observed that Cp − Cv =a for hydrogen gas Cp − Cv =b for nitrogen gas. The correct relation between a and b is :

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Cp and Cv are specific heats at constant pressure and constant volume, respectively. It is observed that Cp − Cv =a for hydrogen gas Cp − Cv =b for nitrogen gas. The correct relation between a and b is :

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