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The current in the windings on a toroid is 2.0 A. There are 400 turns and the mean circumferential length is 40 cm. If the inside magnetic field is 1.0 T, the relative permeability is near

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

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Match the Column I (AC circuit condition) with Column II (power dissipation) and select the correct answer from the codes given below. Column I Column II A. Resistive circuit p. No power dissipation B. Purely inductive or capacitive circuit q. Maximum power dissipation because of `X_C=X_L` C. L-C -R series circuit r. Power dissipated only in the resistor D. Power dissipated at resonance in L-C -R circuit s. Maximum power dissipation

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

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A system has two charges qA = 2.5 × 10–7 C and qB = –2.5 × 10–7 C located at points A: (0, 0, –15 cm) and B: (0,0, +15 cm), respectively. What are the total charge and electric dipole moment of the

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

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Consider a sphere of radius R with charge density distributed as ρ (r ) = ≤ kr r R for = > 0 for r R .(a) Find the electric field at all points r.(b) Suppose the total charge on the sphere is 2e where e is the electron charge. Where can two protons be embedded such that the force on each of them is zero. Assume that the introduction of the proton does not alter the negative charge

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

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Two small conducting sphere of equal radius have charges +1µc and – 2µc respectively and placed at a distance d from each other experience force F1 . If they are brought in contact and separated to the same distance, they experience force F2 . The ratio of F1 to F2 is

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

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It is claimed that two cesium clocks, if allowed to run for 100 years, free from any disturbance, may differ by only about 0.02 s. What does this imply for the accuracy of the standard cesium clock in measuring a time-interval of 1 s

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

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Can a body have a charge of

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

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Consider a uniform electric field E = 3 × 103 î N/C. What is the flux of this field through a square of 10 cm on a side whose plane is parallel to the yz

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

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A cylindrical bar magnet is rotated about its axis (Fig ). A wire is connected from the axis and is made to touch the cylindrical surface through a contact.

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

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An electron moves along the line AB,which lies in the same plane as a circular loop of conducting wires as shown in figure. What will be the direction of current induced if any, in the loop

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

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Show that average heat produced during a cycle of AC is same as produced by DC with `I =

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

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Find the applied horizontal force on BC, (F) as a function of time `'t' (t < l/v)`A conducting square wire frame ABCD of side `l` is pulled by horizontal force so that it moves with constant velocity v. A uniform magnetic field of strength B is existing perpendicular to the plane of wire. The resistance per unit length of wire is `lambda` and negligible self inductance. If at `t= 0,` frame is just at the boundary of magnetic field.

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

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Self-Induction Self-induction is the property of a coil by virtue of which the coil opposes any change in the strength of current flowing through it by inducing an emf in itself. This induced emf is also called back emf. When the current in a coil is switched ON, then the self induction opposes the growth of the current and when it is switch OFF, then the self-induction opposes the decay of the current.The dimensions of self-inductance L

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

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When a body is grounded, electrons from the earth flow into the body. This means the body is :

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

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A (current vs time) graph of the current passing through a solenoid is shown in Fig . For which time is the back electromotive force (u) a maximum. If the back emf at t = 3s is e, find the back emf at t = 7 s, 15s and 40s. OA, AB and BC are straight line segments.

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

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A magnetic field ` hatB = B_o sin( ωt) hat k` covers a large region where a wire AB slides smoothly over two parallel conductors separated by a distance d (Fig.). The wires are in the x-y plane. The wire AB (of length d) has resistance R and the parallel wires have negligible resistance. If AB is moving with velocity v, what is the current in the circuit. What is the force needed to keep the wire moving at constant

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

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When the switch S turned

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

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In the circuit shown below, the ac source has voltage `v = 20 cosomegat` volts with `omega= 2000 `rad/sec.The amplitude of the current will be nearest

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

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A 100 turn closely wound circular coil of radius 10 cm carries a current of 3.2 A.(i) What is the field at the centre of the coil?(ii) What is the magnetic moment of this coil? The coil is placed in a vertical plane and is free to rotate about a horizontal axis which coincides with its diameter. A uniform magnetic field of 2T in the horizontal direction exists such that initially the axis of the coil is in the direction of the field. The coil rotates through an angle of 90° under the influence of the magnetic field.(iii) What are

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

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The force between two charges `0.06 m` apart is `5 N`. If each charge is moved towards each other by `0.04 m`, then the force between them will

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

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