When the length of a wire is doubled while keeping material and area of cross-section constant, what happens to its resistance?
The resistance becomes twice as much
The resistance of a wire is R = ρL/A, where ρ is resistivity, L is length and A is area of cross-section.
If L is doubled and ρ and A stay the same, R also doubles.
Hence, the answer is The resistance becomes twice as much.
Similar Questions
Which of the following symbols represents a rheostat?
Two resistors of 2 Ω and X Ω are connected in series to a 10 V battery. If the current flowing through the resistors is 2 A, then what will be the value of X (in Ohm)?
The resistance of a conductor depends on the:
A straight conductor carrying current is placed parallel to a uniform magnetic field. The force on the conductor will be:
According to the right-hand thumb rule, if the thumb points in the direction of current, then the fingers show:
If an electric heater consumes 1000 W of power, how much electrical energy does it use in 1 hour?
Which of the following properties is unique to the parallel combination of resistors compared to the series combination?
Which component is best represented by a symbol with multiple alternating long and short lines in a circuit diagram?
A heater is rated at 1000 W, 250 V. If it is connected to a 250 V supply, what will be the current drawn by the heater and what is the resistance of the heater?
Two identical bulbs are connected in parallel to a battery. If one bulb burns out, what happens to the brightness of the other bulb?
Important Questions from Current Electricity
Which of the following is a bad conductor of electricity?
In general, in an alternating current circuit
The laws of electromagnetic induction have been used in the construction of a
A 220 volt and 100 watt bulb is connected to a 110 volt source. The power consumption by the bulb is
In the series combination of resistance in current electricity, which of the following is correct?
