Resistance (R) = Resistivity (ρ) × (Length (L) / Area (A))
Given:-
Resistivity (ρ) = 2.8 × 10⁻⁸ ohm meter
Length (L) = 2 meters
Area (A) = 1.55 × 10⁻⁶ square meters
Substitute the values:
R = (2.8 × 10⁻⁸) × (2 / 1.55 × 10⁻⁶)
R = (5.6 × 10⁻⁸) / (1.55 × 10⁻⁶)
R ≈ 0.0361 ohms
Hence answer is 0.0361 ohms
More Questions on Electricity
An electric heater with a power rating of 2 kW is operated for 3 hours daily for the entire month of April. If the cost of electricity is Rs 6 per unit, what is the total electricity bill for the month? (Assume April has 30 days)
→ 2Assertion (A): Tungsten metal is used for making the filament of incandescent electric lamps. Reason (R): Tungsten has a very high melting point and produces light at high temperatures without melting.
→ 3Explain why the main power supply line coming into a house typically uses a thicker gauge copper wire compared to the thinner wires used for individual appliance connections within the house.
→ 4Two electric bulbs, rated 100W, 220V and 60W, 220V respectively, are connected in series to a 220V supply. Which bulb will glow brighter and why?
→ 5A circuit consists of three resistors: R1, R2, and R3. R1 = 5 Ω is connected in series with the parallel combination of R2 = 10 Ω and R3 = 10 Ω. If this circuit is connected to a 12V battery, what is the power dissipated across R1?
→ 6Explain why household electrical appliances are always connected in parallel with the main supply and not in series.
→ 7Assertion (A): Nichrome alloy is extensively used in the heating elements of electrical appliances like toasters and electric irons. Reason (R): Nichrome has a very high resistivity and a high melting point, making it suitable for producing significant heat without melting.
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→ 17The formula for electric energy consumed (E) is:
→ 18A 100W bulb and a 40W bulb are connected in parallel to a 220V supply. Which bulb will glow brighter?
→ 19A 100W bulb and a 40W bulb are connected in series to a 220V supply. Which bulb will glow brighter?
→ 20Which of these is the most suitable material for a heating element?
→ 21What happens to the resistance of a conductor if its area of cross-section is increased?
→ 22The reciprocal of resistance is called:
→ 23In a parallel circuit, if one bulb fuses, the other bulbs:
→ 24In a series circuit, if one bulb fuses, the other bulbs:
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→ 26An electric iron of 1000 W is used for 2 hours daily. If the cost of 1 unit of electricity is Rs. 5, what is the cost of using the iron for 30 days?
→ 27What is the equivalent resistance of three 6 Ohm resistors connected in parallel?
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→ 30If the current through a resistor is doubled, the heat produced in a given time interval will:
→ 31A 2 Ohm resistor carries a current of 3 A. The heat produced in 10 seconds is:
→ 32Which of the following is an ohmic conductor?
→ 33If the temperature of a semiconductor increases, its resistance:
→ 34The direction of electron flow is ___________ to the conventional current.
→ 35The energy supplied by the cell in moving a unit charge from one end to the other is called its:
→ 36What is the cause of 'overloading' in domestic circuits?
→ 37What does a 'short circuit' mean in an electric circuit?
→ 38The symbol for a variable resistor is:
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→ 40If an electric bulb of 40W, 220V is connected to a 110V supply, the power consumed will be:
→ 41Which statement is true for voltage in a parallel circuit?
→ 42Which statement is true for current in a series circuit?
→ 43A device that changes the resistance in an electric circuit is called a:
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→ 50A circuit consists of two resistors in series. If the voltage across the first resistor is 5 V and the total voltage is 12 V, what is the voltage across the second resistor?
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→ 60A component whose resistance changes with voltage is called a:
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→ 114What is meant by saying that the potential difference between two points is 1 V?
→ 115Name a device that helps to maintain a potential difference across a conductor.
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→ 125Why are metals good conductors of electricity whereas glass is a bad conductor of electricity ? Give reason.
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