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Five charges q1, q2, q3, q4, and q5 are fixed at their positions as shown in Fig. S is a Gaussian surface. The Gauss’s law is given by`oint_0^1 vec E cdot vec (ds)=q/epsilon_0` Which of the following statements is correct?

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Two charges –q each are fixed separated by distance 2d. A third charge q of mass m placed at the mid-point is displaced slightly by x (x << d) perpendicular to the line joining the two fixed charged as shown in Fig. . Show that q will perform simple harmonic oscillation of time period..

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A conducting wire XY of mass m and neglibile resistance slides smoothly on two parallel conducting wires as shown in Fig . The closed circuit has a resistance R due to AC. AB and CD are perfect conductors. There is a magnetic field` B = B(t )hatk` . For

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To reduce the reasonant frequency in an LCR series circuit with a

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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 . What is the average power consumption over a

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The armature of dc motor has `20Omega` resistance. It draws current of 1.5 A when run by 220 V dc suppy. The value of back induced in it will

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The self inductance of a coil is 5H, a current of 1A changes to 2A within 5 sec. through the coil. The value of induced emf will

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The impedance of a circuit consists of `3Omega`resistance and `4Omega` reactance. The power factor of the circuit

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An LC circuit contains a 20 mH inductor and a `50muF` capacitor with an initial charge of 10 mc. The resistance of the circuit is negligible. At the instant the circuit is closed be t = 0. At what time is the energy stored compeletly

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If Phase Difference between `E and I` is `pi/4 and f = 50 Hz` then calculate time

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A capacitor, a resistor and a 40 mH inductor are connected in series to an 60Hz AC source of frequency 60Hz, calculate the capacitance of the capacitor, if the current is in phase with the voltage. Also calculate the value of X and

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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If power factor of a R-L series circuit is `1/2` when applied voltage is `V = 100 sin 100pit` volt and resistance of circuit is `200Omega` then calculate the inductance of the

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A paramagnetic sample shows a net magnetisation of 8 Am–1 when placed in an external magnetic field of 0.6T at a temperature of 4K. When the same sample is placed in an external magnetic field of 0.2 T at a temperature of 16K, the magnetisation will

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A permanent magnet in the shape of a thin cylinder of length 10 cm has M = 106 A/m. Calculate the magnetisation current

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Consider a circular current-carrying loop of radius R in the x-y plane with centre at origin. Consider the line intergral ` ℑ (L) = |∫_(-L)^L B dl| ` taken along z-axis. Suppose we replace the circular coil by a square coil of sides R carrying the same

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A current path shaped as shown in figure produces a mag. field at point 'P', the centre of the arc BC. If the arc subtends an angle of `30^0` and the radius of the arc is 0.6 meter. What is the magnitude of the field at point P if the current is 3 AMP

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An electron having mass `9xx 10^(-31)` kg, charge `1.6xx 10^(-19) C` and moving with a velocity of 106 m/s enters a region where mag. field exists. If it describes a circle of radius 0.10 m, the intensity of magnetic field must be ................

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A Galvanometer has a resistance G and 9 current `I_G` flowing in it produces full scale deflection. S1 is the value of the shunt which converts it into an ammeter of range 0 to I and S2 is the value of the shunt for the range 0 to 2I. The ratio `S_1/ S_2` is

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Two thin long parallel wires separated by a distance Y are carrying a current I Amp each. The magnitude of the force per unit length exerted by one wire on their is

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The variation of mag. suceptibility `(chi)` with temperature for a diamagnetic substance is best represented

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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