Physics
A cycle wheel of radius 0.5 m is rotated with constant 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
20
Aug
A cycle wheel of radius 0.5 m is rotated with constant 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 resistance 'R' draws power 'P' when connected to an AC source. [...]
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 metallic rod of mass per unit length 0.5 kg/m is lying horizontally on a smooth inclined plane which makes an angle of 30 degree with the horizontal. The rod is not allowed to slide down by a flowing a current through it when a magnetic field of induction 0.25T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is?
20
Aug
A metallic rod of mass per unit length 0.5 kg/m is lying horizontally on a smooth inclined plane which makes an angle of 30 degree with the horizontal. The rod is not allowed to slide down by a flowing a current through it when a magnetic field of induction 0.25T is acting on it in [...]
A coil of 800 turns effective area 0.05m^2 is kept perpendicular to a magnetic field 5×10^−5 T. When the plane of the coil is rotated by 90 degree around any of its co-planar axis in 0.1 s, the emf induced in the coil will be
20
Aug
A coil of 800 turns effective area 0.05m^2 is kept perpendicular to a magnetic field 5×10^−5 T. When the plane of the coil is rotated by 90 degree around any of its co-planar axis in 0.1 s, the emf induced in the coil will be A coil of 800 turns effective area 0.05m^2 is kept [...]
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 [...]