Current Electricity — Physics STD 12 Science — Question

The value of scattering angle of alpha particle for maximum value of impact parameter is :

The maximum peak to peak voltage of an AM wire is 24 mV and the minimum peak to peak voltage is 8 mV. The modulation factor is

(a) 10%

(b) 20%

(c) 25%

(d) 50%

What is the unit of surface charge density in the SI unit?

A charged particle is released from rest in a region of steady uniform electric and magnetic fields which are parallel to each other the particle will move in a

(a) Straight line

(b) Circle

(c) Helix

(d) Cycloid

An electron is accelerated through a potential difference of 1000 volts. Its velocity is nearly

(a) 3.8

(b) 1.9

(c) 1.9

(d) 5.7

Which of the following has minimum wavelength ?

The smallest temperature difference that can be measured with a combination of a thermocouple of thermo e.m.f. 30mV per degree and a galvanometer of 50 ohm resistance, capable of measuring a minimum current of  3 × 10^–7 amp is

(a) 0.5 degree

(b) 1.0 degree

(c) 1.5 degree

(d) 2.0 degree

A current carrying wire in the neighborhood produces

(a) No field	(b) Electric field only
(c) Magnetic field only	(d) Electric and magnetic fields

In conductor when electrons move between two collisions, their paths are ... A... when external fields are absent and ... B...when external filed is present. Here, A and B refer to:

Gauss is unit of which quantity

(a) H

(b) B

(c) ∅

(d) I