- Adecreasing N
- Bincreasing N
- Cwinding the coil on wooden frame
- Dwinding the coil on china clay
Explanation:
$\text{M}=\mu\text{N}_1\text{N}_2\frac{\text{Area}_{12}}{\text{length}_{12}}$
Area12 - area in common to both the coils where the flux links both of them together.
length12 - length in common to both the coils where the flux links both of them together.
Therefore to increase the mutual inductance, the number of turns can be increased.
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A coil is wound as a transformer of rectangular cross-section. If all the linear dimensions of the transformer are increased by a factor 2 and the number of turns per unit length of the coil remain the same, the self inductance increased by a factor of
|
(a) 16 |
(b) 12 |
(c) 8 |
(d) 4 |
One face of a rectangular glass plate 6 cm thick is silvered. An object held 8 cm in front of the first face, forms an image 12 cm behind the silvered face. The refractive index of the glass is
|
(a) 0.4 |
(b) 0.8 |
(c) 1.2 |
(d) 1.6 |
A conducting ring is placed around the core of an electromagnet as shown in fig. When key K is pressed, the ring

|
(a) Remain stationary |
|
(b) Is attracted towards the electromagnet |
|
(c) Jumps out of the core |
|
(d) None of the above |
Two resistors having equal resistances are joined in series and a current is passed through the combination. Neglect any variation in resistance as the temperature changes. In a given time interval
|
(a) Equal amounts of thermal energy must be produced in the resistors |
|
(b) Unequal amounts of thermal energy may be produced |
|
(c) The temperature must rise equally in the resistors |
|
(d) The temperature must rise unequally in the resistors |

If a steady current of 4 amp maintained for 40 minutes, deposits 4.5 gm of zinc at the cathode and then the electro chemical equivalent will be
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(a) 51 |
(b) 28 |
|
(c) 32 |
(d) 47 |