Question
What happens to resistance of a wire when its length is
doubled (keeping area constant)?Solution
Resistance R∝L, as per the formula R = ρ (L/A). So, if length becomes twice and cross sectional area stays same, resistance becomes 2R. This relationship is critical in designing electric circuits and wires. It also helps explain how electric heaters work.
What is the wavelength of visible spectrum?
Find the equivalent resistance when three resistors of 4 Ω, 6 Ω, and 12 Ω are connected in parallel.
Which of the following does not affect the value of acceleration due to gravity?
In which type of motion does the velocity of a body vary with time?
Half-life of a radioactive substance is 10 days. The time after which only 1/16th of it remains is:
Which law states that “an object remains at rest or in uniform motion unless acted upon by an external force”?
Which of the following is not a nuclear reaction?
Which law explains the relation between pressure and volume of a gas at constant temperature?
What is the minimum escape velocity of rocket to be launched into space?
Which of the following statement is correct?
I. Magnetite is a natural magnet
II. A freely suspended magnet always aligns in N-S direction
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