Electromagnetic Waves — Physics STD 12 Science — Question

If the magnetic flux is expressed in weber, then magnetic induction can be expressed in

(a) Weber/m2

(b) Weber/m

(c) Weber-m

(d) Weber-m2

When a current of 5A flows in the primary coil then the flux linked with the secondary coil is 200 weber. The value of coefficient of mutual induction will be

In Young’s experiment, monochromatic light is used to illuminate the two slits A and B. Interference fringes are observed on a screen placed in front of the slits. Now if a thin glass plate is placed normally in the path of the beam coming from the slit

 

(a) The fringes will disappear

(b) The fringe width will increase

(c) The fringe width will increase

(d) There will be no change in the fringe width but the pattern shifts

Magnetic field intensity is defined as:

Two sources give interference pattern which is observed on a screen, D distance apart from the sources. The fringe width is 2w. If the distance D is now doubled, the fringe width will

(a) Become w/2

(b) Remain the same

(c) Become w

(d) Become 4w

The unit of inductance is

(a) Volt/ampere

(b) Joule/ampere

(c) Volt-sec/ampere

(d) Volt-ampere/sec

The earth's magnetic induction at a certain point is 7 × .  This is to be annulled by the magnetic induction at the centre of a circular conducting loop of radius 5 cm. The required current in the loop is

(a) 0.56 A

(b) 5.6 A

(c) 0.28 A

(d) 2.8 A

The device which works of both modulation and demodulation is called :

In YDSE, the slit widths are in the ratio of 1:9. The ratio of intensity of the maxima to that of the minima is:

Consider the situation of the previous problem. The force on the central charge due to the shell is: