Electric Charges and Fields — Physics STD 12 Science — Question

In a circuit 5 percent of total current passes through a galvanometer.  If resistance of the galvanometer is G then value of the shunt is

(a) 19 G

(b) 20 G

(c)

(d)

A vertical straight conductor carries a current vertically upwards. A point P lies to the east of it at a small distance and another point Q lies to the west at the same distance the magnetic field at P is:

Ray optics is valid, when characteristic  dimensions are

(a) Of the same order as the wavelength of light

(b) Much smaller than the wavelength of light

(c) Of the order of one millimetre

(d) Much larger than the wavelength of light

In the circuit shown here, the readings of the ammeter and voltmeter are

(a) 6 A, 60 V

(b) 0.6 A, 6 V

(c) 6/11 A, 60/11 V

(d) 11/6 A, 11/60 V

Identify the material whose resistivity is more than 10¹⁴ Ωm.

A hollow metal sphere of radius 5cm is charged such that the potential on its surface is 10V. The potential at a distance of 2cm from the centre of the sphere is:

In a simple harmonic motion:

1. The potential energy is always equal to the kinetic energy.
2. The potential energy is never equal to the kinetic energy.
3. The average potential energy in any time interval is equal to the average kinetic energy in that time interval.
4. The average potential energy in one time period is equal to the average kinetic energy in this period.

Imagine that you are sitting in a room with your back to one wall and that an electron beam traveling horizontally from the back wall towards the front one is deflected towards the right. What is the direction of the magnetic induction field that exists in the room? 

The temperature (T) dependence of resistivity (r) of a semiconductor is represented by

(a)

(b)

(c)

(d)