Question

A rectangular loop is being pulled at a constant speed v, through a region of certain thickness d, in which a uniform magnetic field B is set up. The graph between position x of the right hand edge of the loop and the induced emf E will be

(a)

(b)

(c)

(d)

Answer

(b)

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

When light rays from the sun fall on a convex lens along a direction parallel to its axis

(a) Focal length for all colours is the same

(b) Focal length for violet colour is the shortest

(c) Focal length for yellow colour is the longest

(d) Focal length for red colour is the shortest

The electric field between the two spheres of a charged spherical condenser

(a) Is zero

(b) Is constant

(c) Increases with distance from the centre

(d) Decreases with distance from the centre

An electron is moving along the positive X-axis. You want to apply a magnetic field for a short time so that the electron may reverse its direction and move parallel to the negative X-axis. This can be done by applying the magnetic field along

(a) Y-axis

(b) X-axis

(c) Y-axis only

(d) None of these

For photoelectric emission, tungsten requires light of 2300 Å. If light of 1800 Å wavelength is incident then emission

(a) Takes place

(b) Don’t take place

(c) May or may not take place

(d) Depends on frequency

Copper and germanium are cooled from room temperature to 30 K. In this process, the resistance:
In photo-electric effect, when photons of energy ′hv′ are incident on a metal surface, electrons are emitted with some kinetic energy. It is possible to say that:

What happens to the fringe pattern when the Young’s double slit experiment is performed in water instead or air then fringe width

(a) Shrinks

(b) Disappear

(c) Unchanged

(d) Enlarged

In a tangent galvanometer a current of 0.1 A produces a deflection of 30o. The current required to produce a deflection of 60o is

(a) 0.2 A 

(b) 0.3 A

(c) 0.4 A  

(c) 0.5 A

Two sine waves travel in the same direction in a medium. The amplitude of each wave is A and the phase difference between the two waves is 120°. The resultant amplitude will be:
  1. A
  2. 2A
  3. 4A
  4. $\sqrt{2}\text{A}.$

A change of 0.8 mA in the anode current of a triode occurs when the anode potential is changed by 10 V. If m = 8 for the triode, then what change in the grid voltage would be required to produce a change of 4 mA in the anode current

(a) 6.25 V

(b) 0.16 V

(c) 15.2 V

(d) None of these