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NEET Physics Solved Question Paper 2010

Short 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 ?

$Potential due to a single charge is given by V = \frac{1}{4 {πε}_{0}} . \frac{q}{R} ∴ Potential at x = 0, V = V_{1} + V_{2} + V_{3} + . . . . . = \frac{1}{4 {πε}_{0}} . \frac{q}{1} + \frac{1}{4 {πε}_{0}} . \frac{q}{2} + \frac{1}{4 {πε}_{0}} . \frac{q}{4} + \frac{1}{4 {πε}_{0}} . \frac{q}{8} = \frac{q}{4 {πε}_{0}} [1 + \frac{1}{2} + \frac{1}{2^{2}} + \frac{1}{2^{3}} + . . . .] = \frac{q}{4 {πε}_{0}} . \frac{1}{(1 - \frac{1}{2})} = \frac{2 q}{4 {πε}_{0}}$

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 ?

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.

45.

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