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Three particles, each having a charge of 10µc are placed at the corners of an equilateral triangle of side 10 cm. The electrostatic potential energy of the system is (Given `1/(4piepsilon_o) = 9 × 10^9 N.m^2' /'c^2`)

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

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Weather the following is periodic or not?

asked Mar 20, 2022 in 11th Physics by varun (6.7k points)

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A magnetic field in a certain region is given by ` B = B_o cos (ωt)hat k` and a coil of radius a with resistance R is placed in the x-y plane with its centre at the origin in the magnetic field (see Fig ) . Find the magnitude and the direction of the current at (a, 0, 0) at t = π/2ω, t = π/ω and t =

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

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When a voltage measuring device is connected to AC mains, the meter shows the steady input voltage of 220V. This

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An electrical device draws 2kW power from AC mains (voltage223V (rms) = `sqrt50,000` V).The current differs (lags) in phase by `φ tan φ=-3/4` as compared to voltage. Find

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

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For an LCR circuit driven at frequency ω, the equation reads`L (dl)/(dt)+Ri+q/c= V_i= V_m sinωt` Intergrate the equation over one cycle to find that the phase difference between V and i must be

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

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In an ac circuit the emf (e) and the current (i) at any instant core given respectively by `e = E_O sinomegat`, `I= I_o sin (ωt- φ)` The average power in the circuit over one cycle of ac

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

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An alternating voltage `E=200sqrt 2 sin (100t)` is connected to 1 microfarad capacitor through an ac ammeter. The reading of the ammeter shall

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

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A periodic voltage wave form has been shown in fig. Determine. (a) Frequency of the wave form. (b) Average

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

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Calculate the resistance or inductance required to operate a lamp (60V, 10W) from a source of (100 V, 50

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

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A choke coil of resistance R and inductance L is connected in series with a capacitor C and complete combination is connected to a.c. voltage, Circuit resonates when angular frequency of supply is `omega = omega_0`. (a) Find out relation betwen `omega_0, L and C` (b) What is phase difference between V and I at resonance, is it changes when resistance of choke coil is

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

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A closely wound solenoid 80 cm long has 5 layers of windings of 400 turns each. The diameter of the solenoid is 1.8 cm. If the current carried is 8.0 A, estimate the magnitude of B inside the solenoid near its

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

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A magnetic field of 100 G (1 G = 10–4 T) is required which is uniform in a region of linear dimension about 10 cm and area of cross-section about 10–3 m2 . The maximum current-carrying capacity of a given coil of wire is 15 A and the number of turns per unit length that can be wound round a core is at most 1000 turns m–1. Suggest some appropriate design particulars of a solenoid for the required purpose. Assume the core is not

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

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Magnetic field lines show the direction (at every point) along which a small magnetised needle aligns (at the point). Do the magnetic field lines also represent the lines of force on a moving charged particle at every

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

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If the solenoid in Exercise 5 is free to turn about the vertical direction and a uniform horizontal magnetic field of 0.25 T is applied, what is the magnitude of torque on the solenoid when its axis makes an angle of 30° with the direction of applied

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

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A short bar magnet placed in a horizontal plane has its axis aligned along the magnetic north-south direction. Null points are found on the axis of the magnet at 14 cm from the centre of the magnet. The earth’s magnetic field at the place is 0.36 G and the angle of dip is zero. What is the total magnetic field on the normal bisector of the magnet at the same distance as the null–point (i.e., 14 cm) from the centre of the magnet? (At null points, field due to a magnet is equal and opposite to the horizontal component of

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

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A circular current loop of magnetic moment M is in an arbitrary orientation in an external magnetic field B. The work done to rotate the loop by 30° about an axis perpendicular to its plane

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

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Consider a circular current-carrying loop of radius R in the x-y plane with centre at origin. Consider the line intergral ` ℑ (L) = |∫_(-L)^L B dl| ` taken along z-axis. Show that ℑ (L) monotonically increases with

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

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An element `vec(dl)= dxuarr` (where dx = 1 cm) is placed at the origin and carries a large current I = 10 Amp. What is the mag. field on the Y-axis at a distance of 0.5 meter

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

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A He nucleus makes a full rotation in a circle of radius 0.8 meter in 2 sec. The value of the mag. field B at the centre of the circle will be ...................

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

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