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Which of the charges are possible?

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Charging by conduction is possible in

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How many protons are there in

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Coulomb’s law for electrostatic force between two point charges and Newton’s law for gravitational force between two stationary point masses, both have inverse-square dependence on the distance between the charges and masses respectively. Compare the strength of these forces by determining the ratio of their magnitudes (a) for an

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Coulomb’s law for electrostatic force between two point charges and Newton’s law for gravitational force between two stationary point masses, both have inverse-square dependence on the distance between the charges and masses respectively. Estimate the accelerations of electron and proton due to the electrical force of their mutual attraction

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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

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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

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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 by varun (6.7k points)

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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

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Two point charges qA = 3 µC and qB = –3 µC are located 20 cm apart in vacuum. (i) What is the electric field at the midpoint O of the line AB joining the two charges?(ii) If a negative test charge of magnitude 1.5 × 10–9 C is placed at this point, what is the force experienced by the test

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A system has two charges qA = 2.5 × 10–7 C and qB = –2.5 × 10–7 C located at points A: (0, 0, –15 cm) and B: (0,0, +15 cm), respectively. What are the total charge and electric dipole moment of the

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An electric dipole with dipole moment 4 × 10–9 C m is aligned at 30° with the direction of a uniform electric field of magnitude 5 × 104 NC–1 . Calculate the magnitude of the torque acting on the

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A polythene piece rubbed with wool is found to have a negative charge of 3 × 10–7 C(i) Estimate the number of electrons transferred (from which to which?)(ii) Is there a transfer of mass from wool to

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Fig . shows tracks of three charged particles in a uniform electrostatic field. Give the signs of the three charges. Which particle has the highest charge to mass

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An oil drop of 12 excess electrons is held stationary under a constant electric field of 2.55 × 104 `NC^(–1)` (Millikan’s oil drop experiment). The density of the oil is 1.26 g `cm^(–3)`. Estimate the radius of the drop. (g = 9.81 m`cm^(–2)`; e = 1.60 × 10–19

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What will be the total flux through the faces of the cube (Fig. ) with side of length a if a charge q is placed at (I) A: a corner of the cube.(II) B: mid-point of an edge of the

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What will be the total flux through the faces of the cube (Fig. ) with side of length a if a charge q is placed at (I) C: centre of a face of the cube.(II) D: mid-point of B and

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A square of side L meters lies in the x-y plane in a region, where the magnetic field is given by `B =B_o (2hati + 3hatj + 4hatk)` where Bo is constant. The magnitude of flux passing through the square

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A loop, made of straight edges has six corners at A(0,0,0), B(L,O,0) C(L,L,0), D(0,L,0) E(0,L,L) and F(0,0,L). A magnetic field ` B=B_o( hati +hat k)T` is present in the region. The flux passing through the loop ABCDEFA (in that order)

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A cylindrical bar magnet is rotated about its axis (Fig ). A wire is connected from the axis and is made to touch the cylindrical surface through a contact.

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