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Five long wires A, B, C, D and E, each carrying current I are arranged to form edges of a pentagonal prism as shown in Fig. Each carries current out of the plane of paper. What if current in one of the wire (say) A is

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Consider the situation shown in the figure. The wireAB is sliding on the fixed rails with a constant velocity `vecv` . If the wire AB replaced by semi circular wire the magnitude of the induced current

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Consider a tightly wound 100 turn coil of radius 10 cm, carrying a current of 1 A. What is the magnitude of the magnetic field at the centre of the

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Two concentric circular coils X and Y of radii 16 cm and 10 cm, respectively, lie in the same vertical plane containing the north to south direction. Coil X has 20 turns and carries a current of 16 A; coil Y has 25 turns and carries a current of 18 A. The sense of the current in X is anticlockwise, and clockwise in Y, for an observer looking at the coils facing west. Give the magnitude and direction of the net magnetic field due to the coils at their

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

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A square current carrying loop abed is placed near an infinitely long another current carrying wire ef. Now, match the following two columns. Column I Column II A. Net force on `bc and da` p. zero B. Net force on `ab and cd` q. non-zero C. Net force on complete loop `abcd` r. rightwards D. Net force on ab s. constant

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

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A positively charged ball hangs from a silk thread. We put a positive test charge `q_o` at a point and measure `F'/'q_o`, then it can be predicted that the electric field strength

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

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Faraday’s Laws According to the Faraday’s first law, whenever the amount of magnetic flux linked with a circuit changes, an emf is induced in it. Induced current is determined by the rate at which the magnetic flux changes.Mathematically, the magnitude of the induced emf in a circuit is equal to the rate of change of magnetic flux through the circuit.Induced emf `prop` Rate of change of magnetic fluxA copper disc of radius 0.1 m is rotated about its centre with 20 rev/s in a uniform magnetic field of 0.1 T with its plane perpendicular to the field. The emf induced

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

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An electric lamp which runs at 80V DC consumes 10 A current. The lamp is connected to 100 V – 50 Hz ac source compute the inductance of the choke

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

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Let `E_a` be the electric field due to a dipole in its axial plane distant `l` and let `E_q` be the field in the equatorial plane distant `l`, then the relation between `E_a and E_q` will

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An uncharged conductor of inner radius `R_1` and outer radius `R_2` contains a point charge q placed at point P (not at the centre) as shown in figure? Find out the following :(i) `V_C` (ii) `V_A` (iii) `V_B` (iv) `E_A` (v) `E_B` (vi) force on charge Q if it is placed at

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How many protons are there in

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Consider a uniform electric field E = 3 × 103 î N/C. What is the net flux of the uniform electric field of Exercise 1.15 through a cube of side 20 cm oriented so that its faces are parallel to the coordinate

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Fig. shows the electric field lines around three point charges A, B and C. (a) Which charges are positive? (b) Which charge has the largest magnitude?

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

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Consider an infinitely long wire carrying a current I (t ), with` dI/ dt = λ = constant`. Find the current produced in the rectangular loop of wire ABCD if its resistance is R (Fig.

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

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In circular coil. when no. of turns is doubled & resistance becomes half of the initial then inductance

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Figure shows a uniform circular loop of radius ‘a’ having specific resistance `rho` placed in a uniform magnetic fieldB perpendicular to plane of figure. A uniform rod of length 2a & resistance R moves with a velocity v as shown.Find the current in the rod when it has moved a distance `a/2` from the centre of circular loop.[Given `B=sqrt3,a=2,v=3,rho=9/(4pi), R=2sqrt3` all in SI

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A parallel plate capacitor has circular plates of radius 8 cm and plate separation 1 mm. The charge on the plates, if potential difference of `100 V` applied

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

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Assertion: The self-induced emf is also called the back emf. Reason: The self-induced emf opposes any change in the current in a

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What is the de Broglie wavelength associated with an electron moving with a speed of 5.4×106

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Two electric charges 12µc and –6µc are placed 20cm apart in air. There will be a point P on the line joining these charges and outside the region between them, at which the electric potential is zero. The distance of P from –6µc charge is

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

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