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Faraday’s Laws According to the Faraday’s first law, whenever the amount of magnetic flux linked with a circuit changes, an emf is induced in it. Induced current is determined by the rate at which the magnetic flux changes.Mathematically, the magnitude of the induced emf in a circuit is equal to the rate of change of magnetic flux through the circuit.Induced emf `prop` Rate of change of magnetic fluxA copper disc of radius 0.1 m is rotated about its centre with 20 rev/s in a uniform magnetic field of 0.1 T with its plane perpendicular to the field. The emf induced

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

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Two identical balls having like charges and placed at a certain distance apart repel eachother with a certain force. They are brought in contact and then moved apart to a distanceequal to half their initial separation. The force of repulsion between them increases 4.5times in comparison with the initial value. The ratio of the initial charges of the balls

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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 by varun (6.7k points)

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For an LCR circuit driven at frequency ω, the equation reads`L (dl)/(dt)+Ri+q/c= V_i= V_m sinωt` Interpret each term

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

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An electric lamp which runs at 80V DC consumes 10 A current. The lamp is connected to 100 V – 50 Hz ac source compute the inductance of the choke

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

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Five long wires A, B, C, D and E, each carrying current I are arranged to form edges of a pentagonal prism as shown in Fig. Each carries current out of the plane of paper. What if current in one of the wire (say) A is

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Electric charges of `1muC, - 1muC and 2muC` are placed in air at the corners A, B and C respectively of an equilateral triangle ABC having length of each side 10 cm. The resultant force on the charge at C

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What is electrostatics?

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Two concentric circular coils X and Y of radii 16 cm and 10 cm, respectively, lie in the same vertical plane containing the north to south direction. Coil X has 20 turns and carries a current of 16 A; coil Y has 25 turns and carries a current of 18 A. The sense of the current in X is anticlockwise, and clockwise in Y, for an observer looking at the coils facing west. Give the magnitude and direction of the net magnetic field due to the coils at their

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

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(i) Draw a ray diagram to show refraction of a ray of monochromatic light passing through a glass prism. Deduce the expression for the refractive index of glass in terms of angle of prism and angle of minimum deviation, (ii) Explain briefly how the phenomenon of total internal reflection is used in fibre

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The equations of motion of a projectile are given by `x= 18t and 2y = 54t - 9.8t^2`. The angle `theta` of projection

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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The adjoining figure shows a negatively charged electroscope. If a positively charged rod touches the knob, the two leaves will

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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

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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

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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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What is the de Broglie wavelength associated with an electron moving with a speed of 5.4×106

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The Sun’s angular diameter is measured to be 1920′′. The distance D of the Sun from the Earth is `1.496 xx 10^11` m. What is the diameter of the Sun

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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In circular coil. when no. of turns is doubled & resistance becomes half of the initial then inductance

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

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A positively charged ball hangs from a silk thread. We put a positive test charge `q_o` at a point and measure `F'/'q_o`, then it can be predicted that the electric field strength

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

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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 by varun (6.7k points)

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