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A metallic ring of mass m and radius l (ring being horizontal) is falling under gravity in a region having a magnetic field. If z is the vertical direction, the z-component of magnetic field is `B_z = B_o (1+λ z)`. If R is the resistance of the ring and if the ring falls with a velocity v, find the energy lost in the resistance. If the ring has reached a constant velocity, use the conservation of energy to determine v in terms of m, B, λ and acceleration due to gravity

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

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A long solenoid ‘S’ has ‘n’ turns per meter, with diameter ‘a’. At the centre of this coil we place a smaller coil of ‘N’ turns and diameter ‘b’ (where b < a). If the current in the solenoid increases linearly, with time, what is the induced emf appearing in the smaller coil. Plot graph showing nature of variation in emf, if current varies as a function of mt2 +

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

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If a LC circuit is considered analogous to a harmonically oscillating spring block system, which energy of the LC circuit would be analogous to potential energy and which one analogous to kinetic

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

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Draw the effective equivalent circuit of the circuit shown in Fig , at very high frequencies and find the effective

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

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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)

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Study the circuits (a) and (b) shown in Fig and answer the following questions. Can the rms current in circuit (b) be larger than that in

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

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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)

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In series LCR circuit, the plot of `I_max VS ω` is shown in Fig . Find the bandwidth and mark in the

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

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How does the sign of the phase angle φ, by which the supply voltage leads the current in an LCR series circuit, change as the supply frequency is gradually increased from very low to very high

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

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A device ‘X’ is connected to an a.c source. The variation of voltage, current and power in one complete cycle is shown in Fig . Which curve shows power consumption over a full

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

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A device ‘X’ is connected to an a.c source. The variation of voltage, current and power in one complete cycle is shown in Fig . What is the average power consumption over a

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

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A device ‘X’ is connected to an a.c source. The variation of voltage, current and power in one complete cycle is shown in Fig . Identify the

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

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Both alternating current and direct current are measured in amperes. But how is the ampere defined for an alternating

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

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A coil of 0.01 henry inductance and 1 ohm resistance is connected to 200 volt, 50 Hz ac supply. Find the impedance of the circuit and time lag between max. alternating voltage and

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

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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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Explain why the reactance provided by a capacitor to an alternating current decreases with increasing

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

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Explain why the reactance offered by an inductor increases with increasing frequency of an alternating

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

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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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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 `X_C –

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

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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 I M. Another device has twice the values for R, XC and XL. How are the answers

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

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