Electric Charges and Fields — Physics STD 12 Science — Question

A cell of negligible resistance and e.m.f. 2 volts is connected to series combination of 2, 3 and 5 ohm. The potential difference in volts between the terminals of 3 ohm resistance will be

(a) 0.6

(b) 2/3

(c) 3

(d) 6

The kinetic energy of electron in the first Bohr orbit of the hydrogen atom is

(a) – 6.5 eV

(b) – 27.2 eV

(c) 13.6 eV

(d) – 13.6 eV

The magnetic field at the centre of a circular coil of radius r carrying current I is . The field at the centre of another coil of radius 2 r carrying same current I is . The ratio   is

(a)

(b) 1

(c) 2

(d) 4

Curie-Weiss law is obeyed by iron at a temperature ......

(a) Below Curie temperature	(b) Above Curie temperature
(c) At Curie temperature only	(d) At all temperatures

When _15​P³⁰ decays to become _14​Si³⁰, which particle is released?

An electric filament bulb can be worked from:

By properly combining two prisms made of different materials, it is possible to:

1. Have dispersion without average deviation.
2. Have deviation without dispersion.
3. Have both dispersion and average deviation.
4. Have neither dispersion nor average deviation.

P-N diode is :

An arc of a circle of radius R subtends an angle   at the centre. It carries a current i. The magnetic field at the centre will be

(a)

(b)

(c)

(d)

What is the correct order in which the listed atomic models were advanced and accepted, earliest first?