MCQ
Refer to the figure. When does the the galvanometer (G) deflect?
Image
  • A
    The magnet is pushed into the coil
  • B
    The magnet is rotated into the coil
  • C
    The magnet is stationary at the centre of the coil.
  • D
    The number of turns in the coil is reduced.

Answer

  1. The magnet is pushed into the coil

Explanation:

The deflection in the galvanometer (G) occurs, when the magnet is pushed into the coil. This is because the relative motion between the two induces an emf into the coil.

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

Ratio between total intensity of magnetic field at equator to poles is

(a) 1 : 1

(b) 1 : 2

(c) 2 : 1

(d) 1 : 4

In an A.C. circuit the potential difference across an inductance and resistance joined in series are respectively 16V and 20V. The total potential difference across the circuit is.

Focal length of a converging lens in air is R. If it is dipped in water of refractive index 1.33, then its focal length will be around (Refractive index of lens material is 1.5)

(a) R

(b) 2R

(c) 4R

(d) R / 2

The new resistance of wire of R W, whose radius is reduced half, is

(a) 16 R

(b) 3 R

(c) 2R

(d) R

Induced emf opposes :
A pure resistor is joined with a capacitor. The magni- tude of tangent of their phase difference in the cir- cuit is:

An electron is moving towards x-axis. An electric field is along y-direction then path of electron is

(a) Circular

(b) Elliptical

(c) Parabola

(d) None of these

The magnitude of electric field E in the annular region of a charged cylindrical capacitor

(a) Is same throughout

(b) Is higher near the outer cylinder than near the inner cylinder

(c) Varies as 1/r, where r  is the distance from the axis

(d) Varies as , where r  is the distance from the axis

A double convex lens has two surfaces of equal radii R and refractive index $\mu=1.5$ We have,

  1. $\text{f}=\frac{\text{R}}{2}$

  2. $\text{f}=\text{R}$

  3. $\text{f}=-\text{R}$

  4. $\text{f}=2\text{R}$

The refractive index of a piece of transparent quartz is the greatest for

(a) Red light

(b) Violet light

(c) Green light

(d) Yellow light