Chapter 27 – Alternating Current
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In an electromagnetic wave in free space the root mean square value of the electric field is Erms = 6V/m. The peak value of the magnetic field is
20
Aug
In an electromagnetic wave in free space the root mean square value of the electric field is Erms = 6V/m. The peak value of the magnetic field is In an electromagnetic wave in free space the root mean square value of the electric field is Erms = 6V/m. The peak value of the magnetic field [...]
A 100 ohm resistance and a capacitor of 100 ohm reactance are connected in series across a 220V source. When the capacitor is 50% charged the peak value of displacement current is
20
Aug
A 100 ohm resistance and a capacitor of 100 ohm reactance are connected in series across a 220V source. When the capacitor is 50% charged the peak value of displacement current is A 100 ohm resistance and a capacitor of 100 ohm reactance are connected in series across a 220V source. When the capacitor is [...]
A resistance ‘R’ draws power ‘P’ when connected to an AC source. If an inductance is now placed in series with the resistance, such that the impedance of the circuit becomes ‘Z’, the power drawn will be
20
Aug
A resistance ‘R’ draws power ‘P’ when connected to an AC source. If an inductance is now placed in series with the resistance, such that the impedance of the circuit becomes ‘Z’, the power drawn will be A resistance 'R' draws power 'P' when connected to an AC source. If an inductance is now placed [...]
A circuit when connected to an AC source of 12 V gives a current of 0.2 A. The same circuit when connected to a DC source of 12 V, gives a current of 0.4 A. The circuit is
20
Aug
A circuit when connected to an AC source of 12 V gives a current of 0.2 A. The same circuit when connected to a DC source of 12 V, gives a current of 0.4 A. The circuit is A circuit when connected to an AC source of 12 V gives a current of 0.2 A. [...]
In which of the following devices, the eddy current effect is not used ?
20
Aug
In which of the following devices, the eddy current effect is not used ? In which of the following devices the eddy current effect is not used ? August 20, 2020 Category: Chapter 27 - Alternating Current , NEET Last 32 Years Solved 1988 - 2019 Physics and Chemistry Video Solutions , Physics ,
A series R-C circuit is connected to an alternating voltage source. Consider two situation
20
Aug
A series R-C circuit is connected to an alternating voltage source. Consider two situation A series R-C circuit is connected to an alternating voltage source. Consider two situation August 20, 2020 Category: Chapter 27 - Alternating Current , NEET Last 32 Years Solved 1988 - 2019 Physics and Chemistry Video Solutions , Physics ,
The core of any transformer is laminated because
19
Aug
The core of any transformer is laminated because The core of any transformer is laminated because August 19, 2020 Category: Chapter 27 - Alternating Current , NEET Last 32 Years Solved 1988 - 2019 Physics and Chemistry Video Solutions , Physics ,
The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux ϕ linked with the primary coil is given by ϕ=ϕ0+4t, where ϕ is in weber, t is time in seconds and ϕ0 is a constant. The output voltage across the secondary coil is
19
Aug
The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux ϕ linked with the primary coil is given by ϕ=ϕ0+4t, where ϕ is in weber, t is time in seconds and ϕ0 is a constant. The output voltage across the secondary coil is t is time in [...]
A transformer is used to light a 100W and 110V lamp from a 220V mains. If the main current is 0.5A, the efficiency of the transformer is approximately
19
Aug
A transformer is used to light a 100W and 110V lamp from a 220V mains. If the main current is 0.5A, the efficiency of the transformer is approximately A transformer is used to light a 100W and 110V lamp from a 220V mains. If the main current is 0.5A the efficiency of the transformer is [...]
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 [...]