Alternating Current — Physics STD 12 Science — Question

For which of the following particles will it be most difficult to experimentally verify the de-Broglie relationship?

An ammeter reads upto 1 ampere.  Its internal resistance is 0.81 ohm.  To increase the range to 10 A the value of the required shunt is

(a) 0.09 W

(b) 0.03 W

(c) 0.3 W

(d) 0.9 W

The magnetic field in a coil of 100 turns and 40 square cm area is increased from 1 Tesla to 6 Tesla in 2 second. The magnetic field is perpendicular to the coil. The e.m.f. generated in it is

(a)

(b) 1.2 V

(c) 1.0 V

(d)

Free ²³⁸U nuclei kept in a train emit alpha particles. When the train is stationary and a uranium nucleus decays, a passenger measures that the separation between the alpha particle and the recoiling nucleus becomes x in time t after the decay. If a decay takes place when the train is moving at a uniform speed v, the distance between the alpha particle and the recoiling nucleus at a time t after the decay, as measured by the passenger will be:

What conclusion is drawn regarding the magnetic field at a point if a compass needle at that point rests in any direction?

is equal to the work done by an external agent in carrying a unit of positive charge from the arbitrarily chosen reference point (usually infinity) to that point without any acceleration.

For distance far away from centre of dipole the change in magnitude of electric field with change in distance from the centre of dipole is:

An electron of mass m when accelerated through a potential difference V has de-Broglie wavelength λ. The de-Broglie wavelength associated with a proton of mass M accelerated through the same potential difference will be

(a) λ

(b) λ

(c)  λ

(d)  λ

The north pole of a magnet is brought near a stationary negatively charged conductor. What is the force experienced by it at the poles?

A hole diffuses from the p-side to the n-side in a p-n junction. This means that.

1. A bond ia broken on the n-side and the electron freed from the bond jumps to the conduction band.
2. A conduction electron on the p-side jumps to a broken bond to complete it.
3. A bond is broken on the n-side and the electron freed from the bond jumps to a broken bond on the p-side to complete it.
4. A bond is broken on the p-side and the electron freed from the bond jumps to a broken bond on the n-side to complete it.