Which of one is correct
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(a) |
(b) |
(c) |
(d) |
Which of one is correct
|
(a) |
(b) |
(c) |
(d) |
(a)
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The capacitance of an air capacitor is 15 μF the separation between the parallel plates is 6mm. A copper plate of 3mm thickness is introduced symmetrically between the plates. The capacitance now becomes
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(a) 5 μF |
(b) 7.5 μF |
(c) 22.5 μF |
(d) 30 μF |
If a bar magnet of magnetic moment M is freely suspended in a uniform magnetic field of strength B, the work done in rotating the magnet through an angle θ is
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(a) MB(1- sinθ |
(b) MB sinθ |
(c) MB cosθ |
(d) MB(1 – cosθ) |
An object placed 10 cm in front of a lens has an image 20 cm behind the lens. What is the power of the lens (in dioptres)
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(a) 1.5 |
(b) 3.0 |
(c) – 15.0 |
(d) + 15.0 |
A uniform magnetic field, parallel to the plane of the paper existed in space initially directed from left to right. When a bar of soft iron is placed in the field parallel to it, the lines of force passing through it will be represented by