MEDIUM
JEE Main
IMPORTANT
Earn 100
In an experiment, the resistance of a material is plotted as a function of temperature (in some range). As shown in the figure, it is a straight line.
One may conclude that
One may conclude that
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Important Questions on Current Electricity
MEDIUM
JEE Main
IMPORTANT
Space between two concentric conducting spheres of radii and is filled with a medium of resistivity . The resistance between the two spheres will be:
MEDIUM
JEE Main
IMPORTANT
A potentiometer wire having length and resistance is joined to a cell of emf and internal resistance . A cell having EMF and internal resistance is connected. The length , at which the galvanometer, as shown in the figure, shows no deflection is
MEDIUM
JEE Main
IMPORTANT
In the given circuit the cells have zero internal resistance. The currents (in amperes) passing through resistance and respectively, are:
EASY
JEE Main
IMPORTANT
A uniform metallic wire has a resistance of and is bent into an equilateral triangle. Then, the resistance between any two vertices of the triangle is:
MEDIUM
JEE Main
IMPORTANT
A carbon resistor is color coded with green, black, red and silver respectively. The maximum current which can be passed through this resistor is:
HARD
JEE Main
IMPORTANT
The actual value of resistance , shown in the figure is This is measured in an experiment as shown using the standard formula , where and are the readings of the voltmeter and ammeter, respectively. If the measured value of is less, then the internal resistance of the voltmeter is:
MEDIUM
JEE Main
IMPORTANT
The Wheatstone bridge shown in the figure below, gets balanced when the carbon resistor used as has the colour code (orange, red, brown). The resistors and are and , respectively. Assuming that the colour code for the carbon resistors gives their accurate values, the colour code for the carbon resistor, used as , would be
MEDIUM
JEE Main
IMPORTANT
A current of was passed through an unknown resistor which dissipated a power of Dissipated power when an ideal power supply of is connected across it is:
