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Electric Circuits
two similar wires made of the same material each of length 50cm and cross-sectional area 2mm .they are connected in series in an electric circuit to a battery of an internal resistance 0.5ohm . an electric current of 2A flows. when the wires are connected in parallel to the same battery the total current in the circuit increase to 6A : calculate the electromotive force of the battery used
Electric Circuits
a body is weighing 20 kg has a velocity of 5m/s, after one second of starting from the mean position. if the time period is 6 seconds,find the k.E.and P.E. and total energy.
Electric Circuits
distinguish between average speed and rms speed. on driving a scooter for a long time,the air pressure in the tyre slightly increases. why?
Electric Circuits
what is the difference b/w an inductor and a solenoid?
Electric Circuits
The frequency of yellow light is
4.76 × 1014 Hz. Find its wavelength. The speed of light is
2.99792 × 108 m/s . Answer in units of m
4.76 × 1014 Hz. Find its wavelength. The speed of light is
2.99792 × 108 m/s . Answer in units of m
Electric Circuits
1.A utility 4.16 kV three-phase distribution feeder has a three-phase short circuit MVA of 36 MVA with an x/r ratio of 2:1, the single-phase line-to-ground fault current is 2750 A with an x/r ratio of 1:1. Determine the equivalent system impedance in ohms referred to the low side of 4.16 kV-480Y/277 V transformer
2.Determine the short circuit at the terminals of a 500kVa, 4160-480Y/277V, three phase transformer having an impedance of 5.75% and an x/r ratio of 4:1. Neglect system impedance
2.Determine the short circuit at the terminals of a 500kVa, 4160-480Y/277V, three phase transformer having an impedance of 5.75% and an x/r ratio of 4:1. Neglect system impedance
Electric Circuits
1) the current in a 100w, 220v electric light is ?
2) in a red light a lens has a focal length 25cm. in blue light the probable focal length will be----
a) 25.5 b) 24.5 c) 15 d) 35
2) in a red light a lens has a focal length 25cm. in blue light the probable focal length will be----
a) 25.5 b) 24.5 c) 15 d) 35
Electric Circuits
Compute the resistance of a 90-cm length of copper wire with a 0.020 -cm2 cross-sectional area. ( = 1.8 x 10-6 ohm-cm)
Electric Circuits
Why is heat produced in a conductor due to flow of electric current?
Electric Circuits
Suhasini’s uncle is advised by his doctor to have an MRI scan on his chest. Her uncle did not know much about the details and the significance of this test. He also felt that it was too expensive and thought of postponing it.
When suhasini learnt about her uncle’s problems, she immediately decided to do something about it. She took the help of her family, friends and neighbours and arranged for the cost of the test. She also told her uncle that an MRI (Magnetic Reasonance Imaging) scan of his chest would enables the doctors to know the condition of his hearts lungs without causing any( test related) harm to him. This test was expensive because of its set up that needs strong magnetic field ( 0.5T to 3 T) and pulses of radio wave energy.
Her uncle was convinced and had the required MRI scan of his chest done. The resulting information greatly helped his doctors to treat him well.
(a) What according to you are the values displayed by suhasini and her family, friends and neighbours to help her uncle ?
(b) Assuming the MRI scan of his uncle’s chest was done by using a magnetic field of 1T . Find the maximum and minimum value of the force exerted by the magnetic field on a proton that was moving at a speed of 104 m/sec. State the condition under which this force has minimum value.
When suhasini learnt about her uncle’s problems, she immediately decided to do something about it. She took the help of her family, friends and neighbours and arranged for the cost of the test. She also told her uncle that an MRI (Magnetic Reasonance Imaging) scan of his chest would enables the doctors to know the condition of his hearts lungs without causing any( test related) harm to him. This test was expensive because of its set up that needs strong magnetic field ( 0.5T to 3 T) and pulses of radio wave energy.
Her uncle was convinced and had the required MRI scan of his chest done. The resulting information greatly helped his doctors to treat him well.
(a) What according to you are the values displayed by suhasini and her family, friends and neighbours to help her uncle ?
(b) Assuming the MRI scan of his uncle’s chest was done by using a magnetic field of 1T . Find the maximum and minimum value of the force exerted by the magnetic field on a proton that was moving at a speed of 104 m/sec. State the condition under which this force has minimum value.
