A charge q is placed at the center of the line joining two equal charges Q. The system of the three charges will be in equilibrium if q is equal to
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The diagram shows the electric field lines in a region of space containing two small charged spheres, Y and Z then which statement is true?
Which equation correctly shows the force on a charge q in an electric field E
A test charge of 3nC is placed at origin and experiences a force of 9 x 10^{4} N. The electric field at origin is:
In a parallel plate capacitor, the capacity increases if
A parallel plate capacitor is connected to a battery as shown in figure. Consider two situations
(i) key KK is kept closed and plates of capacitors are moved apart using insulating handle
(ii) key KK is opened and plates of capacitors are moved apart using insulating handle
Which of the following statements is correct?
The amplitude of the magnetic field part of a harmonic electromagnetic wave in vacuum is B_{0}= 510 nT. Amplitude of the electric field part of the wave is
It is necessary to use satellites for long distance TV transmission because
The intensity of a plane electromagnetic wave is proportional to
The direction of propagation of an electromagnetic plane wave is
Use the formula λ_{m} T = 0.29 cmK to obtain the characteristic temperature range for λ_{m}=5×10^{7}m
Without the concept of displacement current it is not possible to correctly apply Ampere’s law on a path parallel to the plates of parallel plate capacitor C in
The value of alternating e.m.f. is e = 500 sin 100pt , then the frequency of this potential in Hz is
The domestic power supply is at 220 volt. The amplitude of emf will be
Sinusoidal peak potential is 200 volt with frequency 50Hz. It is represented by the equation
The phase difference between the alternating current and voltage represented by the following equation I = I_{0} sin wt, E = E_{0} cos (wt + p / 3), will be
The inductive reactance of a coil is 1000W. If its self inductance and frequency both are increased two times then inductive reactance will be
In an L.C.R series circuit R = 1W, X_{L} = 1000W and X_{C} = 1000W. A source of 100 m.volt is connected in the circuit the current in the circuit is
A coil of inductance 0.1 H is connected to an alternating voltage generator of voltage E = 100 sin (100t) volt. The current flowing through the coil will be
Alternating current lead the applied e.m.f. by p/2 when the circuit consists of
A long straight wire in the horizontal plane carries a current of 75 A in north to south direction, magnitude and direction of field B at a point 3 m east of the wire is
If a long straight wire carries a current of 40 A, then the magnitude ol the field B at a point 15 cm away from the wire is
The correct plot of the magnitude of magnetic field vs distance r from centre of the wire is, if the radius of wire is R
1 videos26 docs121 tests

1 videos26 docs121 tests
