Questions by varun

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A charged metallic sphere A is suspended by a nylon thread. Another charged metallic sphere B held by an insulating handle is brought close to A such that the distance between their centres is 10 cm, as shown in Fig. (a). The resulting repulsion of A is noted (for example, by shining a beam of light and measuring the deflection of its shadow on a screen). Spheres A and B are touched by uncharged spheres C and D respectively, as shown in Fig. (b). C and D are then removed and B is brought closer to A to a distance

asked Mar 20, 2022 in 12th Physics

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Consider three charges q1 , q2 , q3 each equal to q at the vertices of an equilateral triangle of side l. What is the force on a charge Q (with the same sign as q) placed at the centroid of the triangle, as shown

asked Mar 20, 2022 in 12th Physics

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Consider the charges q, q, and –q placed at the vertices of an equilateral triangle, as shown in Fig. . What is the force on each

asked Mar 20, 2022 in 12th Physics

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An electron falls through a distance of 1.5 cm in a uniform electric field of magnitude 2.0 × 104 N C–1 [Fig. (a)]. The direction of the field is reversed keeping its magnitude unchanged and a proton falls through the same distance [Fig. (b)]. Compute the time of fall in each case. Contrast the situation with that of ‘free fall under

asked Mar 20, 2022 in 12th Physics

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Two charges ±10 µC are placed 5.0 mm apart. Determine the electric field at a point P on the axis of the dipole 15 cm away from its centre O on the side of the positive charge, as shown in Fig. ,

asked Mar 20, 2022 in 12th Physics

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Two charges ±10 µC are placed 5.0 mm apart. Determine the electric field at a point Q, 15 cm away from O on a line passing through O and normal to the axis of the dipole, as shown in fig.

asked Mar 20, 2022 in 12th Physics

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The electric field components in Fig. are Ex = αx 1/2 , Ey = Ez = 0, in which α = 800 N/C m1/2. Calculate the flux through the

asked Mar 20, 2022 in 12th Physics

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The electric field components in Fig. are Ex = αx 1/2 , Ey = Ez = 0, in which α = 800 N/C m1/2. Calculate the charge within the cube. Assume that a = 0.1

asked Mar 20, 2022 in 12th Physics

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An electric field is uniform, and in the positive x direction for positive x, and uniform with the same magnitude but in the negative x direction for negative x. It is given that E = 200 `hati` N/C for x > 0 and E = –200` hati` N/C for x < 0. A right circular cylinder of length 20 cm and radius 5 cm has its centre at the origin and its axis along the x-axis so that one face is at x = +10 cm and the other is at x = –10 cm (Fig. ).

asked Mar 20, 2022 in 12th Physics

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An electric field is uniform, and in the positive x direction for positive x, and uniform with the same magnitude but in the negative x direction for negative x. It is given that E = 200 `hati` N/C for x > 0 and E = –200` hati` N/C for x < 0. A right circular cylinder of length 20 cm and radius 5 cm has its centre at the origin and its axis along the x-axis so that one face is at x = +10 cm and the other is at x = –10 cm (Fig. ).

asked Mar 20, 2022 in 12th Physics

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An early model for an atom considered it to have a positively charged point nucleus of charge Ze, surrounded by a uniform density of negative charge up to a radius R. The atom as a whole is neutral. For this model, what is the electric field at a distance r from the

asked Mar 20, 2022 in 12th Physics

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What is the force between two small charged spheres having charges of 2 × 10–7C and 3 × 10–7C placed 30 cm apart in

asked Mar 20, 2022 in 12th Physics

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The electrostatic force on a small sphere of charge 0.4 µC due to another small sphere of charge –0.8 µC in air is 0.2 N. What is the distance between the two

asked Mar 20, 2022 in 12th Physics

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The electrostatic force on a small sphere of charge 0.4 µC due to another small sphere of charge –0.8 µC in air is 0.2 N. What is the force on the second sphere due to the

asked Mar 20, 2022 in 12th Physics

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Check that the ratio `(ke^2 )/(G m_e m_p)` is dimensionless. Look up a Table of Physical Constants and determine the value of this ratio. What does the ratio

asked Mar 20, 2022 in 12th Physics

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(i) Explain the meaning of the statement ‘electric charge of a body is quantised’.(ii) Why can one ignore quantisation of electric charge when dealing with macroscopic i.e., large scale

asked Mar 20, 2022 in 12th Physics

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When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of

asked Mar 20, 2022 in 12th Physics

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Four point charges qA = 2 µC, qB = –5 µC, qC = 2 µC, and qD = –5 µC are located at the corners of a square ABCD of side 10 cm. What is the force on a charge of 1 µC placed at the centre of the

asked Mar 20, 2022 in 12th Physics

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An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why

asked Mar 20, 2022 in 12th Physics

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Explain why two field lines never cross each other at any

asked Mar 20, 2022 in 12th Physics

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