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Identify the expression for the motional electromotive force from the following?
How many types of power can be defined in an AC circuit?
Identify the factor on which the angle of deviation of the prism does not depend.
A bar of length 0.7 m slides along metal rails at a speed of 1 m/s. The bar and rails are in a magnetic field of 20 T, pointing out into the page. Calculate the motional emf.
In which type of circuit the value of power factor will be minimum?
Which among the following varies in both magnitude and sign over a cycle?
Calculate the refractive index of the material of an equilateral prism for which the angle of minimum deviation is 60°.
A bar of length 0.15 m slides along metal rails at a speed of 5 m/s. The bar and rails are in a magnetic field of 40 T, pointing out into the page. The resistance of two resistors in parallel is both 20 Ω, and the resistance of the bar is 5 Ω. What is the current in the bar?
The frequency of ac is doubled. How does XL get affected?
Pick out the correct combination for a stepup transformer.
At what frequency will a coil, which has an inductance of 2.5 H, have a reactance of 3500 Ω?
What is the order of potential difference built up by the Van de Graff generator?
When was Van de Graff generator invented and by whom?
What happens to the frequency and the wavelength when light passes from a rarer to a denser medium?
A bar of length 2m is said to fall freely in a magnetic field of magnitude 50 T. What is the motional emf in the bar when it has fallen 40 meters?
Why does an inductor offer an easy path to dc and a resistive path to ac?
Identify the correct combination for a stepdown transformer.
What is the relative refractive index of water with respect to glass?
A metal rod is forced to move with constant velocity along two parallel metal rails, connected with a strip of metal at one end across a magnetic field (B) of 0.5 T, pointing out of the page. The rod is of length 45 cm and the speed of the rod is 70 cm/s. The rod has a resistance of 10 Ω and the resistance of the rails and connector is negligible. What is the rate at which energy is being transferred to thermal energy?
Identify the type of materials which have resistivities in the range of 108 Ωm to 106 Ωm.
What is the power factor in a pure resistive circuit?
Which of the following is usually taken to make the core of a transformer?
Identify the material whose resistivity is more than 1014 Ωm.
Determine the peak current if an inductor of inductance 500 mH is connected to an ac source of peak emf 650 V and frequency 100 Hz
What is the power factor in a pure inductive or capacitive circuit?
A transformer has an efficiency of 60% and works at 5kW. If the secondary voltage is 150 V, then what is the secondary current?
What will be the color of the sky in the absence of the atmosphere?
Find out the rms value of current in the circuit wherein a 35 mH inductor is connected to 200 V, 70 Hz ac supply.
Find the resistance value of the carbon resistor if the colors of the four bands are red, red, red and silver respectively.
‘X’ is a type of commercial resistor made from a mixture of clay, carbon black, and resin binder which are pressed and then molded into cylindrical rods by heating. Identify X.
On what factor does the normal shift through a refracting medium depend?
What is the power factor for a series LCR circuit at resonance?
8 docs148 tests

8 docs148 tests
