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A circuit consisting of an inductance and a resistacne joined to a 200 volt supply (A.C.). It draws a current of 10 ampere. If the power used in the circuit is 1500 watt. Calculate the wattless

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A coil has a power factor of 0.866 at 60 Hz. What will be power factor at 180

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A choke coil and a resistance are connected in series in an a.c circuit and a potential of 130 volt is applied to the circuit. If the potential across the resistance is 50 V. What would be the potential difference across the choke

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

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

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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

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An LC circuit contains a 20mH inductor and a `50muF` capacitor with an initial charge of 10mC. The resistance of the circuit is negligible. Let the instant the circuit is closed to be `t = 0.`What is the total energy stored

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

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An LC circuit contains a 20mH inductor and a `50muF` capacitor with an initial charge of 10mC. The resistance of the circuit is negligible. Let the instant the circuit is closed to be `t = 0.`What is the natural frequency of the

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

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An LC circuit contains a 20mH inductor and a `50muF` capacitor with an initial charge of 10mC. The resistance of the circuit is negligible. Let the instant the circuit is closed to be `t = 0.`At what time is the energy stored is completely

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An LC circuit contains a 20mH inductor and a `50muF` capacitor with an initial charge of 10mC. The resistance of the circuit is negligible. Let the instant the circuit is closed to be `t = 0.`At what times is the total energy shared equally between inductor and the

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For the given

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A periodic voltage V varies with time t as shown in the figure. T is the time period. The r.m.s. value of the voltage is

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The potential difference V and current I flowing through the AC circuit is given by `V=5 cos(omegat –pi/6)` volt `and I = 10sinomegat` ampere. The average power dissipated in the circuit

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The radius of a coil decreases steadily at the rate of `10^(–2)` m/s. A constant and uniform magnetic field of induction `10^(–3) Wb'/'m^2` acts perpendicular to the plane of the coil. The radius of the coil when the induced e.m.f. in the coil is `1muV`, is

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A time varying voltage `V=2t` volt is applied across an ideal inductor of inductance `L=2H` as shown in figure. Then select incorrect

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A circular coil of 500 turns encloses an area of `0.04 m^2`. A uniform magnetic field of induction `0.25 Wb'/'m^2` is applied perpendicular to the plane of the coil. The coil is rotated by 90° in 0.1 second at a constant angular velocity about one of its diameters. A galvanometer of resistance `25Omega` was connected in series with the the coil. The total charge that will pass through the galvanometer is

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A condenser of capacity `6 µF` is fully charged using a 6-volt battery. The battery is removed and a resistanceless 0.2 mH inductor is connected across the condenser. The current which is flowing through the inductor when one-third of the total energy is in the magnetic field of the inductor is

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For the circuit shown, which of the following statement(s) is(are)

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In the circuit shown the capacitor has charge Q. At `t=0` sec the key is closed. The charge on the capacitor at the instant potential difference across the inductor `L_1` is zero,

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The figure shows a rod of length `l` with points A and B on it. The rod is moved in a uniform magnetic field `(B_0)` in different ways as shown. In which case potential difference `(V_A–V_B)` between `A & B` is

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

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