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A circular coil of mean radius of 7 cm and having 4000 turns is rotated at the rate of 1800 rev/min in the earth’s magnetic field `(B = 0.5 G)`, the maximum emf induced in coil will

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The magnetic potential energy stored in a certain inductor is `25 mJ`, when the current in the inductor is `60 mA`. This inductor is of

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

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AC Generator An AC generator produces electrical energy from mechanical work, just the opposite of what a motor does. In it, a shaft is rotated by some mechanical means, such as an engine or a turbine starts working and an emf is induced in the coil.It is based on the phenomenon of electromagnetic induction which states that whenever magnetic flux linked with a conductor (or coil) changes, an emf is induced in the coil. The change of flux is greatest at `theta` is equal to (take,`phi_B= NBAcos

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

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A convex lens of focal length 20 cm is placed coaxially with a concave mirror of focal length 10 cm at a distance of 50 cm apart from each other. A beam of light coming parallel to the principal axis is incident on the convex lens. Find the position of the final image formed by this combination. Draw the ray diagram showing the formation of the

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

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When light travels from a rarer to a denser medium, the speed decreases. Does the reduction in speed imply a reduction in the energy carried by the light

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Two slits are made one millimetre apart and the screen is placed one metre away. What is the fringe separation when bluegreen light of wavelength 500 nm is

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

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What is the effect on the interference fringes in a Young’s double-slit experiment due to: the monochromatic source is replaced by a source of white light?(In each operation, take all parameters, other than the one specified, to remain

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The work function of caesium is 2.14 eV. Find the wavelength of the incident light if the photocurrent is brought to zero by a stopping potential of 0.60

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

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An infinitly long thin straight wire has uniform linear charge density of `1/3` c/m . Then, the magnitude of the electric intiensity at a point 18 cm away is .......... `NC^(–1)`

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

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A non-uniform bar of weight W is suspended at rest by two strings of negligible weight as shown in Fig.. The angles made by the strings with the vertical are 36.9° and 53.1° respectively. The bar is 2 m long. Calculate the distance d of the centre of gravity of the bar from its left end.

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

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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

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

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A circular coil expands radially in a region of magnetic field and no electromotive force is produced in the coil. This can be

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Find the current in the wire for the configuration shown in Fig . Wire PQ has negligible resistance. B, the magnetic field is coming out of the paper. θ is a fixed angle made by PQ travelling smoothly over two conducting parallel wires seperated by a distance

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

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If a current I given by `I_O sin(omegat-pi/ 2)` flows in an ac circuit across which an ac potential of `E = E_O sinomegat` has been applied, then the power consumption p in the circuit will

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In an LCR series ac circuit the voltage across each of the components L, C and R is 50 V. The voltage across the LC combination will

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A periodic voltage V varies with time t as shown in the figure. T is the time period. The r.m.s. value of the voltage is

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

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A loop of irregular shape carrying current is located in an external magnetic field. If the wire is flexible, why does it change to a circular

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Two moving coil meters, M1 and M2 have the following particulars: R1 = 10 Ω, N1 = 30, A1 = 3.6 × 10–3 m2 , B1 = 0.25 T R2 = 14 Ω, N2 = 42, A2 = 1.8 × 10–3 m2 , B2 = 0.50 T (The spring constants are identical for the two meters). Determine the ratio of(i) current sensitivity (ii) voltage sensitivity of M2 and M1

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

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An electron moving with a speed along the positive x-axis at y = 0 enters a region of uniform magnetic field `vecB= Bohatk` which exists to the right of y - axis. The electron exits from the region after some time with the speed at co-ordinate y

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

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Match the Column I (type of body) with Column II (electric field) and select the correct answer from the codes given below. Column I Column II A. Infinite plane sheet of charge p. `(lambda)/(2piepsilon_0r)` B. Infinite plane sheet of uniform thickness q. `(sigma)/(2epsilon_0)` C. Infinitely long uniformly charged straight wire r. `(sigma)/(epsilon_0)`

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

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