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प्रश्न
How is the magnetic field inside a given solenoid made strong?
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उत्तर
The magnetic field lines inside a solenoid can be made strong by
(i) Inserting a ferromagnetic core
(ii) Increasing the number of turns of the solenoid
(iii) Increasing the current passing through the solenoid.
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संबंधित प्रश्न
Derive the expression for the magnetic field due to a solenoid of length ‘2l’, radius ‘a’ having ’n’ number of turns per unit length and carrying a steady current ‘I’ at a point
on the axial line, distance ‘r’ from the centre of the solenoid. How does this expression compare with the axial magnetic field due to a bar magnet of magnetic moment ‘m’?
Derive an expression for the mutual inductance of two long co-axial solenoids of same length wound one over the other,
A closely wound solenoid 80 cm long has 5 layers of windings of 400 turns each. The diameter of the solenoid is 1.8 cm. If the current carried is 8.0 A, estimate the magnitude of B inside the solenoid near its centre.
Obtain the expression for the magnetic energy stored in an inductor of self-inductance L to build up a current I through it.
Draw and compare the pattern of the magnetic field lines in the two cases ?
A tightly-wound, long solenoid is kept with its axis parallel to a large metal sheet carrying a surface current. The surface current through a width dl of the sheet is Kdl and the number of turns per unit length of the solenoid is n. The magnetic field near the centre of the solenoid is found to be zero. (a) Find the current in the solenoid. (b) If the solenoid is rotated to make its axis perpendicular to the metal sheet, what would be the magnitude of the magnetic field near its centre?
A capacitor of capacitance 100 µF is connected to a battery of 20 volts for a long time and then disconnected from it. It is now connected across a long solenoid having 4000 turns per metre. It is found that the potential difference across the capacitor drops to 90% of its maximum value in 2.0 seconds. Estimate the average magnetic field produced at the centre of the solenoid during this period.
Why is the magnetic field approximately zero outside a long solenoid?
In the Ampere's Law derivation for a solenoid, what is the contribution of the perpendicular sides \(bc\) (inside to outside) and \(da\) (outside to inside) to \(\oint \vec{B} \cdot d\vec{l}\)?
Which statement about the ends of a solenoid versus a toroid is correct?
