Current Electricity

Related Questions

• The circuit shown here is used to compare the e.m.f. of two cells ${E_1}$ and ${E_2}({E_1} > {E_2})$. The null point is at C when the galvanometer is connected to ${E_1}$. When the galvanometer is connected to ${E_2}$, the null point will be

  ---

• The potential difference across the 100$\Omega$ resistance in the following circuit is measured by a voltmeter of 900 $\Omega$ resistance. The percentage error made in reading the potential difference is

  ---

• Two wires that are made up of two different materials whose specific resistance are in the ratio 2 : 3, length 3 : 4 and area 4 : 5. The ratio of their resistances is

  ---

• A potentiometer is used for the comparison of e.m.f. of two cells ${E_1}$ and ${E_2}$. For cell ${E_1}$ the no deflection point is obtained at 20$cm$ and for ${E_2}$ the no deflection point is obtained at 30$cm$. The ratio of their e.m.f.'s will be

  ---

• A 100 V voltmeter of internal resistance $20\,k\Omega $ in series with a high resistance R is connected to a 110 V line. The voltmeter reads 5 V, the value of R is

  ---