Embibe Experts Solutions for Exercise 3: Assignment

A galvanometer of resistance $100\mathrm{\Omega }$ gives full scale deflection at $10 \mathrm{mA}$ current. What should be the value of shunt so that it can measure a current of $100 \mathrm{mA}?$

Two cells of emf $E_1$ and $E_2$ are joined in series and the balancing length of the potentiometer wire is $625 \mathrm{cm}.$ If the terminals of $E_1$ are reversed, the balancing length obtained is $125 \mathrm{cm}.$ Given $E_2>E_1,$ the ratio $E_1: E_2$ will be

A $10 \mathrm{m}$ long potentiometer wire is connected to a battery having a steady voltage. A Leclanche cell is balanced at $4 \mathrm{m}$ of the wire. If the length is kept the same but its cross-section is doubled, the null point will be obtained at

Out of the two bulbs in a household circuit, one bulb glows brighter than the other, Which of the two bulbs has a large resistance?

How many $60 \mathrm{W}$ bulbs may be safely run on $220 \mathrm{V}$ using a $5 \mathrm{A}$ fuse?

Three identical bulbs $B_1, B_2$ and $B_3$ are connected to the mains as shown in figure. If $B_3$ is disconnected from the circuit by opening switch $S,$ then incandescence of bulb $B_1$ will

A $50 \mathrm{W}$ bulb connected in series with a heater coil is put to an $\mathrm{AC}$ mains. Now the bulb is replaced by a $100 \mathrm{W}$ bulb. The heater output will

Two heater coils separately take $10$ minute and $5$ minute to boil certain amount of water. If both the coils are connected in series, the time taken will be