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What focal length should the reading spectacles have for a person for whom the least distance of distinct vision is 50

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The objective of an astronomical telescope has a diameter of 150 mm and a focal length of 4.00 m. The eyepiece has a focal length of 25.00 mm. Calculate the magnifying and resolving power of telescope. (`lambda = 6000 A^o` for yellow

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Two point charges `q_1=2 µc` and `q_2=1 µc` are placed at distance b = 1cm and a = 2 cm from the origin on the y and x axes as shown in figure. The electric field vector at point P (a, b) will subtend an angle `theta` with the X - axis given

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Two point charges qA = 3 µC and qB = –3 µC are located 20 cm apart in vacuum. (i) What is the electric field at the midpoint O of the line AB joining the two charges?(ii) If a negative test charge of magnitude 1.5 × 10–9 C is placed at this point, what is the force experienced by the test

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A point charge causes an electric flux of –1.0 × 103 `Nm^2` /C to pass through a spherical Gaussian surface of 10.0 cm radius centred on the charge. What is the value of the point

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A conducting sphere of radius 10 cm has an unknown charge. If the electric field 20 cm from the centre of the sphere is 1.5 × 103 N/C and points radially inward, what is the net charge on the

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The mutual inductance M12 of coil 1 with respect to coil

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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` . If

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An inductor of reactance 1 Ω and a resistor of 2 Ω are connected in series to the terminals of a 6 V (rms) a.c. source. The power dissipated in the circuit

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

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A ring of radius r is rotating about its diameter with angular velocity `omega` in a perpendicular magnetic field `vecB` It has 20turns.The emf induced

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The time constant of a LR circuit is 20 ms The circuit is connected at t = 0 and the steady state current is found to be 4A. Find the current at 80

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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

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A straight wire carrying a current of 12 A is bent into a semi-circular arc of radius 2.0 cm as shown in Fig. (a). Consider the magnetic field B at the centre of the arc.(i) What is the magnetic field due to the straight segments?(ii) In what way the contribution to B from the semicircle differs from that of a circular loop and in what way does it resemble?(iii) Would your answer be different if the wire were bent into a semi-circular arc of the same radius but in the opposite way as shown in Fig.

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Fig. shows a small magnetised needle P placed at a point O. The arrow shows the direction of its magnetic moment. The other arrows show different positions (and orientations of the magnetic moment) of another identical magnetised needle Q. (i) In which configuration the system is not in equilibrium?(ii) In which configuration is the system in (i) stable, and (ii) unstable equilibrium?(iii) Which configuration corresponds to the lowest potential energy among all the configurations shown?

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Electric Charges The physical property of matter that causes it to experience a force when placed in an electromagnetic field is called electric charge. Electric charge is a characteristic that accompanies fundamental particles, wherever they exist. The process of charging a neutral body by bringing a charged body nearby it without making contact between the two bodies is known as charging by induction.Figures given below are showing the sequential steps of charging a conductor permanently by using the process of charging by induction.If an object is positively charged, theoretically, the mass of the

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The potential in the equatorial plane of a dipole having dipole moment `p`

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Resistance and Resistivity The materials can be classified as conductors, semiconductors and insulators depending on their resistivities, in an increasing order of their values. Metals have low resistivities in the range of `10^(-8)Omegam` to `10^(-6)Omegam`. At the other end are insulators like ceramic, rubber and plastics having resistivities `10^(18)` times greater than metals or more. In between these two are the semiconductors. These however, have resistivities characteristically decreasing with a rise in temperature. The resistivities of semiconductors can be decreased by adding small amount of suitable impurities. This last feature is exploited in use of semiconductors for electronic devices.Commercially produced

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A coil and a bulb are connected in series with a DC source, a soft iron core is inserted in the coil, then the intensity of the

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Find the position of the image formed by the lens combination given in the Fig.

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The near point of a hypermetropic person is 75 cm from the eye. What is the power of the lens required to enable the person to read clearly a book held at 25 cm from the

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

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