The instant at which a bulb is switched on, its power is maximum , then it decreases to a steady value . Explain.

A dry cell of emf 1.5 V and internal resistance 0.10 Omega is connected across a resistor in series with a very low resistance ammeter. When the circuit is switched on , the ammeter reading settles to a steady value of 2.0 A . (i) What is the steady rate of chemical energy consumption of the cell ? (ii) What is the steady rate of energy dissipation inside the cell ? (ii) What is the steady rate of energy dissipation inside the resistor ? (iv) What is the steady power out put of the source?

Pick a combination in which change on capacitor is maximum at steady state.

In which medium oxidizing power of KMnO_4 is maximum?

The supply voltage to room is 120 V. The resistance of the lead wires is 6Omega . A 60 W bulb is already switched on. What is the decrease of voltage across the bulb, when a 240 W heater is switched on in parallel to the bulb?

When a dry a cell is connected acrossa bulb and the circuit is switched on , then the brightness of bulb goes on decreasing . Explain.

Statement I: As the temperature of the black body increases, the wavelength at which the spectral intensity (E_lamda) is maximum decreases. Statement II: The wavelength at which the spectral intensity will be maximum for a black body is proportional to the fourth power of its absolute temperature.

Which has maximum polarising power in cation ?

A cylindrical rod of heat capacity 120 J//K in a room temperature 27^(@)C is heated internally by heater of power 250W , The steady state temperature attained by the rod is 37^(@)C . Fin the following: (a) The initial rate of increse in temperature (b) The steady state rate of emission of radiant heat. If the heater is switched off, find (c) The initial rate of decrease is temperature (d) The rate of decrease in temperature of the cylinder when its temperature falls to 31^(@)C and (e) The maximum amount of heat lost by the cylinder

If a constant potential difference is applied across a bulb, the current slightly decreases as time passes and then becomes constant. Explain.

In the circuit shown the cell will deliver maximum power to the network if the value of R is