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Define Capacitive reactance.
Concept: Different Types of AC Circuits: AC Voltage Applied to a Capacitor
Define Impedance.
Concept: Different Types of AC Circuits: AC Voltage Applied to a Series LCR Circuit
What is the average value of alternating current over a complete cycle?
Concept: Power in AC Circuit
An alternating voltage is given by e = 8sin628.4t. Find
- peak value of e.m.f.
- frequency or e.m.f.
- instantaneous value of e.m.f. at time t = 10. ms
Concept: Average and RMS Values
Draw a neat labelled diagram for the construction of 'cyclotron'
Concept: Cyclotron
The combined resistance of a galvanometer of resistance 500Ω and its shunt is 21Ω. Calculate the value of shunt.
Concept: Moving Coil Galvanometer
A rectangular coil of a moving coil galvanometer contains 50 turns each having area 12 cm2 . It is suspended in radial magnetic field 0.025 Wb/m2 by a fibre of twist constant 15 x10-10 Nm/degree. Calculate the sensitivity of the moving coil galvanometer.
Concept: Moving Coil Galvanometer
Show that the current flowing through a moving coil galvanometer is directly proportional to the angle of deflection of coil.
Concept: Moving Coil Galvanometer
In a cyclotron, magnetic field of 3·5Wb/m2 is used to accelerate protons. What should be the time interval in which the electric field between the Dees be reversed?
(Mass of proton = 1· 67 x 10-27Kg, Charge on proton =1·6x10-19c).
Concept: Cyclotron
A circular coil of 250 turns and diameter 18 cm carries a current of 12A. What is the magnitude of magnetic moment associated with the coil?
Concept: Moving Coil Galvanometer
An ideal voltmeter has _______.
(A) low resistance
(b) high resistance
(C) infinite resistance
(D) zero resistance
Concept: Moving Coil Galvanometer
If a watch-glass containing a small quantity of water is placed on two dissimilar magnetic poles, then water ______.
Concept: Cyclotron
Explain how moving coil galvanometer is converted into a voltmeter. Derive the necessary formula.
Concept: Moving Coil Galvanometer
A rectangular coil of a moving coil galvanometer contains 100 turns, each having area
15 cm2. It is suspended in the radial magnetic field 0.03 T. The twist constant of suspension
fibre is 15 x 10-10 N-m/degree. Calculate the sensitivity of the moving coil galvanometer.
Concept: Moving Coil Galvanometer
The fraction of the total current passing through the galvanometer is ............ .
a) `S/(S+G)`
b) `G/(S+G)`
c) `(S+G)/G`
d) `(S+G)/S`
Concept: Moving Coil Galvanometer
A moving coil galvanometer has a resistance of 25Ω and gives a full scale deflection for a current of 10mA. How will you convert it into a voltmeter having range 0 - 100 V?
Concept: Moving Coil Galvanometer
A galvanometer has a resistance of 16Ω. It shows full scale deflection, when a current of 20 mA is passed through it. The only shunt resistance available is 0.06 which is not appropriate to convert a galvanometer into an ammeter. How much resistance should be connected in series with the coil of galvanometer, so that the range of ammeter is 8 A?
Concept: Moving Coil Galvanometer
Explain Ampere’s circuital law.
Concept: Ampere’s Circuital Law
A cyclotron is used to accelerate protons to a kinetic energy of 5 MeV. If the strength of magnetic field in the cyclotron is 2T, find the radius and the frequency needed for the applied alternating voltage of the cyclotron. (Given : Velocity of proton= `3xx10^7 m//s`)
Concept: Cyclotron
