Physics
A 220 – volt input is supplied to a Transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the efficiency of the transformer is 80%, the current drawn by the primary windings of the transformer is
19
Aug
A 220 – volt input is supplied to a Transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the efficiency of the transformer is 80%, the current drawn by the primary windings of the transformer is A 220 - volt input is supplied to a Transformer. The output circuit draws [...]
A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6 A, the voltage across the secondary coil and the current in the primary coil respectively are
19
Aug
A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6 A, the voltage across the secondary coil and the current in the primary coil respectively are A transformer having efficiency of 90% is working on 200 V and 3 kW [...]
An inductor 20 mH, a capacitor 100 μF and a resistor 50Ω are connected in series across a source of emf, V = 10 sin 314 t. The power loss in the circuit is
19
Aug
An inductor 20 mH, a capacitor 100 μF and a resistor 50Ω are connected in series across a source of emf, V = 10 sin 314 t. The power loss in the circuit is a capacitor 100 μF and a resistor 50Ω are connected in series across a source of emf An inductor 20 mH [...]
In an AC circuit the emf (V) and the current (i) at any instant are given respectively by V= V0 sin ωt i=i0 sin (ωt−ϕ) The average power in the circuit over one cycle of AC is
19
Aug
In an AC circuit the emf (V) and the current (i) at any instant are given respectively by V= V0 sin ωt i=i0 sin (ωt−ϕ) The average power in the circuit over one cycle of AC is In an AC circuit the emf (V) and the current (i) at any instant are given respectively by [...]
Power dissipated in an L-C-R series circuit connected to an AC source of emf ε is
19
Aug
Power dissipated in an L-C-R series circuit connected to an AC source of emf ε is Power dissipated in an L-C-R series circuit connected to an AC source of emf ε is August 19, 2020 Category: Chapter 27 - Alternating Current , NEET Last 32 Years Solved 1988 - 2019 Physics and Chemistry Video Solutions [...]
In an electrical circuit, R, L, C and ac voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and the current in the circuit is π/3. If instead C is removed from the circuit, the phase difference is again π/3. The power factor of the circuit is
19
Aug
In an electrical circuit, R, L, C and ac voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and the current in the circuit is π/3. If instead C is removed from the circuit, the phase difference is again π/3. The power factor of [...]
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NEET Last 32 Years Solved 1988 - 2019 Physics and Chemistry Video Solutions
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C and ac voltage source are all connected in series. When L is removed from the circuit ,
In an electrical circuit ,
L ,
R ,
the phase difference between the voltage and the current in the circuit is π/3. If instead C is removed from the circuit ,
the phase difference is again π/3. The power factor of the circuit is ,
The variation of EMF with time for four types of generators are shown in the figures. Which amongst them can be called AC ?
19
Aug
The variation of EMF with time for four types of generators are shown in the figures. Which amongst them can be called AC ? The variation of EMF with time for four types of generators are shown in the figures. Which amongst them can be called AC ? August 19, 2020 Category: Chapter 27 - [...]
A cycle wheel of radius 0.5 m is rotated with constant angular velocity of 10 rad/sec in a region of magnetic field of 0.1 T which is perpendicular to the plane of the wheel the emf generated between its centre and the rim is…
19
Aug
A cycle wheel of radius 0.5 m is rotated with constant angular velocity of 10 rad/sec in a region of magnetic field of 0.1 T which is perpendicular to the plane of the wheel the emf generated between its centre and the rim is… A coil of resistance 400 Ω is placed in a magnetic [...]
A long solenoid of diameter 0.1 m has 2×10^4 turns per metre.At the centre of the solenoid, a coil of 100 turns and radius 0.01 m is placed with its axis coinciding with the solenoid axis.The current in the solenoid reduces at a constant rate to 0 A from 4 A in 0.05 s. If the resistance of the coil is 10 π^2Ω, the total charge flowing through the coil during this time is.
19
Aug
A long solenoid of diameter 0.1 m has 2×10^4 turns per metre.At the centre of the solenoid, a coil of 100 turns and radius 0.01 m is placed with its axis coinciding with the solenoid axis.The current in the solenoid reduces at a constant rate to 0 A from 4 A in 0.05 s. If [...]
A coil of resistance 400 Ω is placed in a magnetic field. If the magnetic flux ϕ (Wb) linked with the coil varies with time t (sec) as ϕ = 50t2 +4 The current in the coil at t= 2 sec is
19
Aug
A coil of resistance 400 Ω is placed in a magnetic field. If the magnetic flux ϕ (Wb) linked with the coil varies with time t (sec) as ϕ = 50t2 +4 The current in the coil at t= 2 sec is A coil of resistance 400 Ω is placed in a magnetic field. If [...]