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The electric flux for gaussian surface A that enclose the chrged particles in free space is ............. (given `q_1 = –14nc, q_2 = 78.85 nc, q_3 =

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Two points are at distances a and `b (a < b)` from a long string of charge per unit length `lambda`.The potential difference between the points in proportional to

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The springs of spring factor k, 2k, k respectively are connected in parallel to a mass m. If the mass = 0.08kg m and k = 2N|m, then find the new time

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Is it

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In Exercise 4.11 obtain the frequency of revolution of the electron in its circular orbit. Does the answer depend on the speed of the electron?

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A ball of superconducting material is dipped in liquid nitrogen and placed near a bar magnet. In which direction will it

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For the mag. field to be maximum due to a small element of current carrying conductor at a point, the angle between the element and the line joining the element to the given point must

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The deflection in a Galvanometer falls from 50 division to 20 when `12Omega` shunt is applied. The Galvanometer resistance is

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The deflection in moving coil Galvanometer is reduced to half when it is shunted with a `40Omega` coil. The resistance of the Galvanometer is

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In a moving coil galvanometer, the deflection of the coil `theta` is related to ele. current I by the

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The magnetic field at a point x on the axis of a small bar magnet is equal to the at a point y on the equator of the same magnet. The ratio of the distances of x and y from the centre of the magnet

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If a plastic rod rubbed with fur is made to touch two small pith balls suspended nearby, then which figure shows their final

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One metallic sphere A is given positive charge whereas another identical metallic sphere B of exactly same mass as of A is given equal amount of negative charge.

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In nature, the electric charge of any system is always equal

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Force (F ) between two charges varies with distance (r) between them

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Charges `± 20 nC` are separated by `5 mm`. Calculate the magnitude of dipole

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Assertion: Mass of a body does not decreases, when it is negatively charged. Reason: Charging is not mainly due to transfer of

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The physical quantity having SI unit `NC^(-1)m` is

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Under what conditions current passing through the resistance R can be increased by short circuiting the battery of emf `E_2` ? The internal resistances of the two batteries are `r_1 and r_2`,

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According to Kirchhoff’s current law as applied to a junction in a network of

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