Hot questions

0 votes

0 answers

A coil of inductance L has an inductive reactance of `X_L` in an AC circuit in which the effective current is I. The coil is made from a super-conducting material and has no resistance. The rate at which power is dissipated in the coil

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

0 votes

0 answers

For an LCR circuit, the power transferred from the driving source to the driven oscillator is `P=I^2

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

0 votes

0 answers

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 will be magnetic induction at a point on the axis O?

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

0 votes

0 answers

Proton in an Electric Field Potential difference `(DeltaV)` between two points `A and B` separated by a distance `x`, in a uniform electric field `E` is given by `DeltaV =-Ex`, where `x` is measured parallel to the field lines. If a charge `q_0` moves from A to B, the change in potential energy `(DeltaU)` is given as `DeltaU=q_0 DeltaV`. A proton is released from rest in uniform electric field of magnitude `8.0 xx 10^4 Vm^(-1)` directed along the positive X-axis. The proton undergoes a displacement of 0.50 m in the direction of E.Mass of a proton `= 1.66 xx 10^(-27)

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

0 votes

0 answers

A sinusoidal voltage of peak value `300 V` and an angular frequency `omega = 400 rads^(-1)` is applied to series L-C-R circuit, in which `R=3Omega, L = 20 mH and C = 625muF`. The peak current in the circuit

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

0 votes

0 answers

Find the electric field due to an infinitely long cylindrical charge distribution of radius R and having linear charge density `lambda` at a distance half of the radius from its

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

0 votes

0 answers

An electron falls through a distance of 1.5 cm in a uniform electric field of magnitude 2.0 × 104 N C–1 [Fig. (a)]. The direction of the field is reversed keeping its magnitude unchanged and a proton falls through the same distance [Fig. (b)]. Compute the time of fall in each case. Contrast the situation with that of ‘free fall under

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

0 votes

0 answers

Can the instantaneous power output of an ac source ever be negative? Can the average power output be

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

0 votes

0 answers

A long cylindrical wire carries a positive charge of linear density `lambda. An electron `(-e, m)` revolves around it in a circular path under the influence of the attractive electrostatic force The speed of electron

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

0 votes

0 answers

(i) Draw a ray diagram to show refraction of a ray of monochromatic light passing through a glass prism. Deduce the expression for the refractive index of glass in terms of angle of prism and angle of minimum deviation, (ii) Explain briefly how the phenomenon of total internal reflection is used in fibre

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

0 votes

0 answers

Consider a light beam incident from air to a glass slab at Brewster’s angle as shown in Fig. A polaroid is placed in the path of the emergent ray at point P and rotated about an axis passing through the centre and perpendicular to the plane of the

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

0 votes

0 answers

An electron gun with its collector at a potential of 100 V fires out electrons in a spherical bulb containing hydrogen gas at low pressure (∼10–2 mm of Hg). A magnetic field of 2.83 × 10–4 T curves the path of the electrons in a circular orbit of radius 12.0 cm. (The path can be viewed because the gas ions in the path focus the beam by attracting electrons, and emitting light by electron capture; this method is known as the ‘fine beam tube’ method.) Determine e/m from the

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

0 votes

0 answers

(a) Sketch electric lines of force due to (i) isolated positive change (ie q>0) and(ii) isolated negative change ( ie q(b) Two point changes q and –q are placed at a distance 2a apart. Calculate the electric field at a point P situated at a distance r along the perpendicular bisector of the line joining the charges. What is the field when r >>

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

0 votes

0 answers

Which of the following combinations should be selected for better tuning of an LCR circuit used for

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

0 votes

0 answers

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.We have two bodies with charge `q_1 and q_2` on them, then `q_1 + q_2 = 0`,

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

0 votes

0 answers

The self-inductance of a coil having 500 turns is `50 mH`. The magnetic flux through the cross-sectional area of the coil while current through it is 8 mA, is found to

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

0 votes

0 answers

A polythene piece rubbed with wool is found to have a negative charge of 3 × 10–7 C(i) Estimate the number of electrons transferred (from which to which?)(ii) Is there a transfer of mass from wool to

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

0 votes

0 answers

Study the circuits (a) and (b) shown in Fig and answer the following questions. Under which conditions would the rms currents in the two circuits be the

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

0 votes

0 answers

A coil having area `2m^2` is placed in a magnetic field which changes from 1 wb /`m^2` to 4 wb/`m^2` in an interval of 2 second. The emf induced in the coil of single turn

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

0 votes

0 answers

A convex lens of focal length 30 cm is placed coaxially with a convex mirror of radius of curvature 20 cm. The two are kept at 15 cm from each other. A point object lies 60 cm in front of the convex lens. Draw a ray diagram to show the formation of the image by the combination. Determine the nature and position of the image

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

Hot questions

Categories