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All engineering phenomena deal with definite and measured quantities and so depend on the making of the measurement. We must be clear and precise in making these measurements. To make a measurement, magnitude of the physical quantity (unknown) is compared.The record of a measurement consists of three parts, i.e. the dimension of the quantity, the unit which represents a standard quantity and a number which is the ratio of the measured quantity to the standard quantity.If the length of rectangle `l = 10.5 cm,` breadth `b = 2.1 cm` and minimum possible measurement by scale `= 0.1 cm`, then the

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

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Faraday Cage A Faraday cage or Faraday shield is an enclosure made of a conducting material. The fields within a conductor cancel out with any external fields, so the electric field within the enclosure is zero.These Faraday cages act as big hollow conductors. You can put things to shield them from electrical fields. Any electrical shocks the cage receives, pass harmlessly around the outside of the cage. Example of a real-world Faraday cage

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

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Match the Column I (potential) with Column II (value) for electric potential at different points `P_1, P_2, P_3 and P_4` as shown in the figure with respect to an electric dipole.Each points `P_1, P_2, P_3 and P_4` are equal distance r from mid-point `O` of dipole. Column I Column II A. `V_1` p. 0 B. `V_2` q. `p/(4sqrt2pi epsilon_0r^2)` C. `V_3` r. `(-p)/(4piepsilon_0r^2)` D. `V_4` s. `p/(4pi epsilon_0r^2)`

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

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Electric charges of `+10µc, 5µc, –3µc and 8µc` are placed at the corners of a square of side `sqrt2`m the potential at the centre of the square is

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

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What is permittivity of free space, permittivity and relative permittivity.

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

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Two co-axial solenoids are made by a pipe of cross sectional area `10 cm^2` and length 20 cm If one of the solenoid has 300 turns and the other 400 turns, their mutual inductance

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

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Match the Column I (angle) with Column II (work done) and select the correct option from the codes given below. Column I Column II A. `theta < 90°` p. Friction B. `theta= 90°` q- Satellite rotating around the earth C. `0 > 90°` r. Coolie is lifting a luggage

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

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Explain coulomb's law?

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

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Assertion: For uniform motion, velocity is the same as the average velocity at all instants. Reason: In uniform motion along a straight line, the object covers equal distances in equal intervals of

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

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Petrol tankers plying on highways often have metal chains attached to that drag along the road. Could you say why ?

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

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The wavelength of light in the visible region is about 390 nm for violet colour, about 550 nm (average wavelength) for yellowgreen colour and about 760 nm for red colour. From which of the photosensitive materials with work functions listed in Table 11.1 and using the results of (i),

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

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Three charges Q, +q and +q are placed at the vertices of an equilateral triangle of side `l` as shown in the figure. It the net electrostatic energy of the system is zero, then Q is

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

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A point charge +q, is placed at a distance d from an isolated conducting plane. The field at a point P on the other side of the plane

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Coulomb's law is applicable to

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

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If C1 = 3pF and C2 = 2pF, calculate the equivalent capacitance of the given network between points A &

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

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What is the force between two 1C charges separated by 1m?

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An arbitrary surface encloses a dipole. What is the electric flux through this

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An electron enters uniform electric field maintained by parallel plates and of value `E V m ^(-1)` with a velocity `v ms^(-1)`, the plates are separated by a distance d metre, then acceleration of the electron in the field is , . Ee x -

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

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A simple pendulum consists of a small sphere of mass m suspended by a thread of length `l`. The sphere carries a positive charge q. The pendulum is placed in a uniform electric field of strength E directed Vertically upwards. If the electrostatic force acting on the sphere is less than gravitational force the period of pendulum

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

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(i) Obtain lens maker's formula using the expression`n_2/v-n_1/u=((n_2-n_1))/R`Here, the ray of light propagating from a rarer medium of refractive index `(n_1)` to a denser medium of refractive index `(n_2)` is incident on the convex side of spherical refracting surface of radius of curvature R. (ii) Draw a ray diagram to show that image formation by a concave mirror when the object is kept between its focus and the pole. Using this diagram, derive the magnification formula for the image

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

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