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प्रश्न
Two bar magnets are quickly moved towards a metallic loop connected across a capacitor ‘C’ as shown in the figure. Predict the polarity of the capacitor.
उत्तर
Red lines represent the magnetic lines due to the magnets. Blue line represents the magnetic line due to the current induced in the loop.
Polarity of the capacitor: lower plate is positive; upper plate is negative.
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संबंधित प्रश्न
Why do the electrostatic field lines not form closed loops?
Which among the curves shown in the fig. cannot possibly represent electrostatic field lines?
(a)
(b)
(c)
(d)
(e)
(a) Derive an expression for the electric field E due to a dipole of length '2a' at a point distant r from the centre of the dipole on the axial line.
(b) Draw a graph of E versus r for r >> a.
(c) If this dipole were kept in a uniform external electric field E0, diagrammatically represent the position of the dipole in stable and unstable equilibrium and write the expressions for the torque acting on the dipole in both the cases.
The intensity of the electric field at a perpendicular distance of 0·5 m from an infinitely long line charge having linear charge density (λ) is 3-6 × 103 Vm-1. Find the value of λ.
Draw the pattern of electric field lines, when a point charge –Q is kept near an uncharged conducting plate.
Explain why two field lines never cross each other at any point?
Figure shows electric field lines in which an electric dipole P is placed as shown. Which of the following statements is correct?
If Ea be the electric field strength of a short dipole at a point on its axial line and Ee that on the equatorial line at the same distance, then:
