Current Electricity — Physics STD 12 Science — Question

Resistors of 1, 2, 3 ohm are connected in the form of a triangle. If a 1.5 volt cell of negligible internal resistance is connected across 3 ohm resistor, the current flowing through this resistance will be

(a) 0.25 amp

(b) 0.5 amp

(c) 1.0 amp

(d) 1.5 amp

Let r be the distance of a point on the axis of a magnetic dipole from its centre. The magnetic field at such a point is proportional to:

An engine uses 30A of current. The resistance offered is 15 ohms. Calculate the power consumed by the engine in horse power.

de-Broglie hypothesis treated electrons as

(a) Particles

(b) Waves

(c) Both ‘a’ and ‘b’

(d) None of these

The resistance of a heater coil is 110 ohm. A resistance R is connected in parallel with it and the combination is joined in series with a resistance of 11 ohm to a 220 volt main line. The heater operates with a power of 110 watt. The value of R in ohm is

(a) 12.22	(b) 24.42
(c) Negative	(d) That the given values are not correct

The electrostatic energy of the system made by two electric dipoles kept at a distance 'r' is proportional to :

Wave nature of light is verified by

(a) Interference

(b) Photoelectric effect

(c) Reflection

(d) Refraction

The current in the given circuit is

(a) 0.1 A

(b) 0.2 A

(c) 0.3 A

(d) 0.4 A

As the quantum number increases, the difference of energy between consecutive energy levels?