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Answer the following questions: Interstellar space has an extremely weak magnetic field of the order of 10–12 T. Can such a weak field be of any significant consequence? Explain. [Note: Exercise 2 is meant mainly to arouse your curiosity. Answers to some questions above are tentative or unknown. Brief

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Magnetic field lines are always nearly normal to the surface of a ferromagnet at every point. (This fact is analogous to the static electric field lines being normal to the surface of a conductor at every point.)

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

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Explain: What kind of ferromagnetic material is used for coating magnetic tapes in a cassette player, or for building ‘memory stores’ in a modern

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Suppose we want to verify the analogy between electrostatic and magnetostatic by an explicit experiment. Consider the motion of electric dipole p in an electrostatic field E

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Do magnetic forces obey Newton’s third law. Verify for two current elements`dl_1 = dl hatj ` located at the origin and `dl_2 = dl hatj ` located at (0, R, 0). Both carry current

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The variation of magnetic suceptibility `(chi)` with absolute temperature T for a termomagnetic material

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The variation of the intensity of magnetisation (I) with respect to the magnetising field (H) in a diamagnetic substance is described by the

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A charged particle is free to move in an electric field. It will

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Two condensers `C_1 and C_2` in a circuit are joined as shown in figure. The potential of point A is `V_1` and that of B is `V_2` . The potential of point `D` will

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

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EMF of a CellAn electric cell is a source of energy that maintains a continuous flow of charge in a circuit. It changes chemical energy into electrical energy. It has two electrodes, positive electrode and negative electrode as shown below.Electric cell has to do some work in maintaining the current through a circuit. The work done by the cell in moving unit positive charge through the whole circuit (including the cell) is called the electromotive force (emf) of the cell. When R is infinite, then potential difference V between P and N

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

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Commercial Electrical EnergyAn electrical appliance uses a lot of electric energy when it is operated e.g., geysers heaters etc. The electrical energy consumed is dependent on the time for which a specific appliance of fixed power rating is used. However, the energy used in hour is denoted as `1 kWh=3.6 xx 10^6` joule. This is represented as 1 unit. Different electrical appliance have difference power consumption which is mentioned on the device clearly.A bulb is rated `60 W, 220 V`. It

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

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The magnitude of the magnetic field inside a long solenoid is increased

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Which of the following expression represents the relation between orbital magnetic moment and orbital angular momentum of an

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Assertion: The poles of magnet cannot be separated by breaking into two pieces. Reason: The magnetic moment will be reduced to half when a magnet is broken into two equal

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A square loop of wire, side length `10 cm` is placed at angle of 45° with a magnetic field that changes uniformly from 0.1 T to zero in `0.7s`. The induced current in the loop (its resistance is 111)

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Which of the following is not an application of eddy

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Assertion: Mutual inductance of two coils does not depends on the distance between the coils and their orientation. Reason: It does not depend on the magnetic material filled between the

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Alternating current is transmitted to distant

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Assertion: AC generator works on the principle of self induction. Reason: Magnetic flux linked with armature coil during rotation is zero

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Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards as shown in Fig. . A current in the coil produces a deflection of 3.5o of the mirror. What is the displacement of the reflected spot of light on a screen placed 1.5 m

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

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