Subject

Physics

Class

NEET Class 12

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 Multiple Choice QuestionsShort Answer Type

41.

A circular disc rolls down on an inclined plane without slipping. What fraction of its total energy is translational ?


42.

An infinite number of charges, each equal to q, are placed along the x-axis at x=1, x=2, x = 4, x=8 and so on. What is the potential at x = 0 due to this set of charges ?


43.

A liquid flows through two capillary tubes A and B connected in series. The length and radius of B are twice those of A. What is the ratio of the pressure difference across A to that across B ?

 


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44.

A 50 cm long conductor AB moves with a speed 4 m/s in a magnetic field B = 0.01 Wb/m2 as shown. Find the emf generated and power delivered if resistance of the circuit is 0.1 Ω.


Given, l = 50 cm = 50 × 10-2 m, v = 4 m/s

         B = 0.01 Wb/m2

Motional emf, e = vBl = 4 × 0.01 × 50 ×10-2

                       = 200 × 10-4 = 2 × 10-2 V

Power, P = e2R = 4 × 10-40.1 

              = 4 × 10-3 W


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45.

An electron is moving with velocity 2 i^ + 2 j^ m/s in an electric field of intensity E = i^ + 2 j^ - 8 k^ volt/m and a magnetic field of B = 2 j^ + 3 k^ tesla. Find the magnitude of force on the electron.


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