Current Electricity

Related Questions

• In the given figure, potential difference between A and B is

  ---

• In an experiment to measure the internal resistance of a cell by potentiometer, it is found that the balance point is at a length of 2m when the cell is shunted by a $5\,\Omega $ resistance; and is at a length of 3m when the cell is shunted by a $10\,\Omega $ resistance. The internal resistance of the cell is, then

  ---

• A heating coil can heat the water of a vessel from $20^\circ C$ to $60^\circ C$ in 30 minutes. Two such heating coils are put in series and then used to heat the same amount of water through the same temperature range. The time taken now will be (neglecting thermal capacity of the coils)

  ---

• What is the reading of voltmeter in the following figure

  ---

• Two resistances are connected in two gaps of a metre bridge. The balance point is 20 cm from the zero end. A resistance of 15 ohms is connected in series with the smaller of the two. The null point shifts to 40 cm. The value of the smaller resistance in ohms is

  ---