Priyanka B Solutions for Chapter: Electricity, Exercise 6: Assignment-3

A wire of length $L$ and resistance $R$ is stretched so that its length is doubled and the area of cross-section is halved. How will its resistance change?

A wire of length $L$ and resistance $R$ is stretched so that its length is doubled and the area of cross-section is halved. How will its resistivity change?

A wire of length '$l$' and resistance '$R$' is stretched so that its length is doubled and area of cross-section is halved. How will its resistivity change? Justify your answer.

What do the following symbol mean in the circuit diagrams?

An electric circuit consisting of $0.5 \mathrm{m}$ long nichrome wire $XY,$ an ammeter, a voltmeter, four cells of $1.5 \mathrm{V}$ each and plug key were set-up.

Draw the diagram of this electric circuit to study the relation between potential difference maintained between the points $X$ and $Y$ and electric current flowing through $XY.$

An electric circuit consisting of $0.5 \mathrm{m}$ long Nichrome wire $XY,$ an ammeter, a voltmeter, four cells of $1.5 \mathrm{V}$ each and plug key were set-up. 

The graph shown is plotted between $V$ and $I$ values. What would be the value of ratio, when potential differences is $0.8 \mathrm{V},$ and $1.2 \mathrm{V}.$ What conclusion can you draw from these values?

Draw a circuit diagram for the verification of Ohm's law. Also plot graphically the variation of current with potential difference.

Calculate the resistance of a wire, when a potential difference of $2 \mathrm{V}$ is maintained for $1 \mathrm{A}$ current to flow through it.