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A 60 W load is connected to the secondary of a transformer whose primary draws line voltage. If a current of 0.54 A flows in theload, what is the current in the primary coil? Comment on the type of transformer being

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` Multiply the equation by i and simplify where

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

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A rectangular loop with a sliding rod of length 2m & resistance `2Omega`. It moves in a uniform magnetic field of 3T perpendicular to plane of loop. The external force required to keep the rod moving with constant velocity of `2ms^(-1)`

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

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In ac circuit with voltage V and current I, the power dissipaled

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

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A lamp consumes only 50% of peak power in an ac circuit. What is the phase difference between the applied voltage and the circuit

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

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A resistor and a capicitor are connected in series with an ac source. If the potential drop across the capacitor is 5 V and that across resistor is 12 V, the applied voltage

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

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The instanteneous value of current in an A.C. circuit is `I= 2sin (100pi t+pi/3)A`. The current will be maximum for the first time

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

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The value of alternating emf E in the given ckt will

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

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The power factor of an ac circuit having resistance (R) and inductance (L) connected in series and an angular velocity w

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

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In a series resonant LCR circuit, the voltage across R is 100 V and `R= 1kOmega` with `C =2muF`. The resonant frequency `omega` is 200 rad/s.At resonance the voltage across L

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

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In given circuit applied voltage `V = 50sqrt2 sin 100pit` volt and ammeter reading is 2A then calculate value of

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

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A 50 W, 100 V lamp is to be connected to an AC mains of 200 V, 50 Hz. What capacitance is essential to be put in series with the lamp

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

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For what frequency the voltage across the resistance R will be

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

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A coil, a capacitor and an A.C. source of rms voltage 24 V are connected in series, By varying the frequency of the source, a maximum rms current 6 A is observed, If this coil is connected to a bettery of emf 12 V, and internal resistance `4Omega` , then calculate the current through 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.`What is the total energy stored

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

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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

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

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A square coil of side 10 cm consists of 20 turns and carries a current of 12 A. The coil is suspended vertically and the normal to the plane of the coil makes an angle of 30º with the direction of a uniform horizontal magnetic field of magnitude 0.80 T. What is the magnitude of torque experienced by the

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

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A uniform magnetic field of 1.5 T exists in a cylindrical region of radius10.0 cm, its direction parallel to the axis along east to west. A wire carrying current of 7.0 A in the north to south direction passes through this region. What is the magnitude and direction of the force on the wire if,(i) the wire intersects the axis,(ii) the wire is turned from N-S to northeast-northwest direction,(iii) the wire in the N-S direction is lowered from the axis by a distance of 6.0

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

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The diagrams given in Fig. show magnetic field lines (thick lines in the figure) wrongly. Point out what is wrong with them.

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

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Does a bar magnet exert a torque on itself due to its own field? Does one element of a current-carrying wire exert a force on another element of the same

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

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