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An inductor `(X_L=2Omega)` a capacitor `(X_C=8Omega)` and a resistance `(8Omega)` is connected in series with an ac source. The voltage output of A.C source is given by `V=10 cos 2pi50t`. Find the instantaneous p.d. between A and B when the voltage output from source is half of its

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The wires which connect the battery of an automobile to its starting motor carry a current of 300 A (for a short time). What is the force per unit length between the wires if they are 70 cm long and 1.5 cm apart? Is the force attractive or

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The diagrams given in Fig. show magnetic field lines (thick lines in the figure) wrongly. Point out what is wrong with them.

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A solenoid has a core of a material with relative permeability 400. The windings of the solenoid are insulated from the core and carry a current of 2A. If the number of turns is 1000 per metre, calculate(i) H,(ii) M,(iii) B (iv) the magnetising current Im

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

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Answer the following questions: The earth may have even reversed the direction of its field several times during its history of 4 to 5 billion years. How can geologists know about the earth’s field in such distant

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A circular coil of 16 turns and radius 10 cm carrying a current of 0.75 A rests with its plane normal to an external field of magnitude 5.0 × 10–2 T. The coil is free to turn about an axis in its plane perpendicular to the field direction. When the coil is turned slightly and released, it oscillates about its stable equilibrium with a frequency of 2.0 s–1. What is the moment of inertia of the coil about its axis of

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

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A short bar magnet of magnetic movement 5.25 × 10–2 J T –1 is placed with its axis perpendicular to the earth’s field direction. At what distance from the centre of the magnet, the resultant field is inclined at 45° with earth’s field on(i) its normal bisector (ii) its axis. Magnitude of the earth’s field at the place is given to be 0.42 G. Ignore the length of the magnet in comparison to the distances

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The primary origin(s) of magnetism lies

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Essential difference between electrostatic shielding by a conducting shell and magnetostatic shielding is due

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Assume the dipole model for earth’s magnetic field B which is given by BV = vertical component of magnetic field = `μ_0 /(4π) (2mcosθ )/r^3 ` BH = Horizontal component of magnetic field = `μ_0 /(4π) (sinθm)/r^3 ` θ = 90° – lattitude as measured from magnetic equator. Find loci of points for which

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

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Consider the plane S formed by the dipole axis and the axis of earth. Let P be point on the magnetic equator and in S. Let Q be the point of intersection of the geographical and magnetic equators. Obtain the declination and dip angles at P and

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Biot-Savart law indicates that the moving electrons (velocity v) produce a magnetic field B such

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An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is

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

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A uniform conducting wire of length 12a and resistance R is wound up as a current carrying coil in the shape of (i) an equilateral triangle of side a; (ii) a square of sides a and, (iii) a regular hexagon of sides a. The coil is connected to a voltage source V0. Find the magnetic moment of the coils in each

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As shown in figure a conductor carrying a current I. Find the magnetic field intensity at the point

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The strength of the magnetic field at a point y near a long straight current carrying wire is B. The field at a distance y/2 will

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Circular loop of a wire and a long straight `I_C` , `I_E` respectively as shown in fig. Assuming that these are placed in the same plane. The mag. field will be zero at the centre of the Loop when separation H is

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

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

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A solenoid of 1.5 meter length and 4 cm diameter possesses 10 turn per cm. A current of 5 Amp is flowing through it. The magnetci induction at axis inside the solenoid

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

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Two particles X and Y having equal charges, after being accelerated through the same potential difference, enter a region of uniform mag. field and desoribe circular path of radius R1 and R2 respectively. The ratio of mass of X to that of Y is

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

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