A charge Q is uniformly distributed over a large plastic plate. The electric field at point P close to centre of plate is 10Vm⁻¹. If the plastic plate is replaced by copper plate of the […]
A solid which is transparent to visible light and whose conductivity increases with temperature is formed by
Options
(a) Metallic binding (b) Ionic binding (c) Covalent binding (d) Van der walls binding
Correct […]
A change of 0.04 V takes place between the base and the emitter when an input signal is connected to the CE transistor amplifier. As a result, 20μA change take place in the base current […]
Out of the following options which one can be used to produce a propagating electromagnetic wave?
Options
(a) A stationary charge (b) A chargeless particle (c) An accelerating charge (d) A charge moving […]
A coil has an area of 0.05 m² and it has 800 turns. It is placed perpendicularly in a magnetic field of strength 4×10⁻⁵ Wb/m². It is rotated through 90⁰ in 0.1 sec. The avarage […]
A copper disc of radius 0.1 m is rotated about its centre, with 10 revolutions per second, in a uniform magnetic field of 0.1 tesla with its plane perpendicular to the field. The e.m.f. induced […]
During production of cathode ray
Options
(a) d.c. source is connected across cathode ray tube (b) a.c. source is connected across cathode ray tube (c) Electric field is perpendicular to magnetic field (d) […]
Excitation energy of a hydrogen like ion, in its first excitation state, is 40.8 eV. The energy needed to remove the electron from the ion in ground state is
Options
(a) 13.6 eV […]
A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively with and being short circuited through a resistance of 10Ω. Its internal resistance is
Options
(a) 2.0 ohm […]
24 cells of emf 1.5 V each having internal resistance of 1 ohm are connected to an external resistance of 1.5 ohms. To get maximum current,
Options
(a) all cells are connected in […]
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