MCQ
The value of mutual inductance can be increased by.
  • A
    decreasing N
  • B
    increasing N
  • C
    winding the coil on wooden frame
  • D
    winding the coil on china clay

Answer

  1. increasing N

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.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor:

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

The power of a convex lens is :

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

What is moving coil galvanometer used for?
When a hydrogen bomb explodes, which of the following is used?
A charge q is placed at the centre of the open end of a cylindrical vessel (figure). The flux of the electric field through the surface of the vessel is:

  1. $\text{Zero}$

  2. $\frac{\text{q}}{\in_0}$

  3. $\frac{\text{q}}{2\in_0}$

  4. $\frac{2\text{q}}{\in_0}$

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

(a) 51  

(b) 28 

(c) 32  

(d) 47