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There is another useful system of units, besides the SI/mks A system, called the cgs (centimeter-gram-second) system. In this system Coloumb’s law is given by`F=(Qq)/r^2 hatr` where the distance r is measured in cm (= 10–2 m), F in dynes (=10–5 N) and the charges in electrostatic units (es units), where 1es unit of charge =`1/[3] ×10^(-9)`The number [3] actually arises from the speed of light in vaccum which is now taken to be exactly given by c = 2.99792458 × 108 m/s. An approximate value of c then is c = [3] × 108 m/s. (i)

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In series LCR circuit, the plot of `I_max VS ω` is shown in Fig . Find the bandwidth and mark in the

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A resistor `30_Omega` , inductor of reactance `10_Omega` and the capacitor of reactance `10_Omega` are connected in series to an ac voltage source `e = 300sqrt 2 sin(ωt)` The current in the circuit

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A charge Q is uniformly distributed over the surface of non-conducting disc of radius R. The disc rotates about an axis perpendicular to its plane and passing tarough its centre with an angular velocity co. As a result of this rotation a magnetic field of induction B is obtained at the centre of the disc. If we keep both the amount of charge placed on the disc and its angular velocity to be constant and vary the radius of the disc then the variation of the magnetic induction at the centre of the disc will be represented by the

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Which of the following statement(s) is/are incorrect regarding the point

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What is the work done in moving a 2 µ C point change from corner A to corner B of a square ABCD when a 10 µ C charge exist at the centre of the

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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. ).

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

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A device ‘X’ is connected to an a.c source. The variation of voltage, current and power in one complete cycle is shown in Fig . Which curve shows power consumption over a full

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A coil having n turns & resistance `ROmega` is connected with a galvanometer of resistance `4ROmega`. This combination is moved from a magnetic field W1 Wb to W2 Wb in t second. The induced current in the circut

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Two identical magnets moving towards a coil, connecting a condenser at rear side shown in fig., with equal speed from opposite sides

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If `I=I_0sin omegat, E = E_0 cos [omegat+pi/3]`. Calculate phase difference between `E and

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An electron emitted by a heated cathode and accelerated through a potential difference of 2.0 kV, enters a region with uniform magnetic field of 0.15 T. Determine the trajectory of the electron if the field(i) is transverse to its initial velocity,(ii) makes an angle of 30º with the initial

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In a H-atom, an electron moves in a circular orbit of radius `5.2xx 10^(-11)` meter and produces a mag. field of 12.56 Tesla at its nucleus. The current produced by the motion of the electron will be .................

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Electric Dipole An electric dipole is a pair of point charges with equal magnitude and opposite in sign separated by a very small distance. The mid-point of locations of `-q and q` is called the centre of the dipole. The strength of an electric dipole is measured by a vector quantity known as electric dipole moment `(p)` which is the product of the charge `(q)` and separation between the charges `(2l)`.In most molecules, the centres of positive charges and of negative charges lie at the same place, hence their dipole moment is zero. `e.g. CO_2, CH_4`. However, they develop a

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The electric potential of earth is taken to be zero, because earth is a

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Current through the `5 Omega` resistor

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Use the mirror equation to deduce that: an object placed between f and 2f of a concave mirror produces a real image beyond

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A myopic adult has a far point at 0.1 m. His power of accomodation is 4 diopters. What power lenses are required to see distant

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What is the effect on the interference fringes in a Young’s double-slit experiment, (a) the separation between the two slits is increased(b) what should the width of each slit be to obtain 10 maxima of the double slit pattern within the central maximum of the single slit

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