The resistance of a bulb filament is 100 Ω at a temperature of 100⁰C. If its temperature coefficient of resistance be 0.005 per ⁰C, its resistance will become 200Ω at a temperature of
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Consider the following two statements: (a) Kirchhoff’s junction law follows from the conservation of charge (b) Kirchhoff’s loop law follows from the conservation of energy which is the following is correct?
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(a) […]
To draw the maximum current from a combination of cells, how should be the cells be grouped?
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(a) Parallel (b) Series (c) Depends upon the relative values of internal and external resistance […]
When a current of (2.5±0.5) A flows through a wire, it develops a potential difference of (20±1) V, then the resistance of wire is
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(a) (8±2)Ω (b) (8±1.6)Ω (c) (8±1.5)Ω (d) (8±3)Ω
The kirchoff’s first law (∑i=0) and second law (∑iR=∑E), where the symbols have their usual meanings, are respectively based on
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(a) conservation of charge, conservation of energy (b) conservation of charge, conservation […]
A student measures the terminal potential difference (V) of a cell (of emf E and internal resistance r) as a function of the current (I) flowing through it. The slope and intercept, of the graph […]
Two cells, having the same e.m.f. are connected in series through an external resistance R. Cells have internal resistances r₁ and r₂ (r₁ > r₂) respectively. When the circuit is closed, the potential difference across […]
Two resistors of 6Ω and 9Ω are connected in series to a 120 V source. The power consumed by 6Ω resistor is
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(a) 384Ω (b) 616Ω (c) 1500Ω (d) 1800Ω
Correct Answer:
384Ω
Ohm’s law valid
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(a) only for conductors (b) for semiconductors (c) for triode valves (d) for all materials
Correct Answer:
only for conductors
Explanation:
No explanation available. Be the first to write […]
Length of a conductor is 50 cm radius of cross section 0.1 cm and resistivity of the conductor=5×10⁻⁵ Ω cm⁻¹. The resistance is
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(a) 8×10⁻² Ω (b) 8×10⁻³ Ω (c) 8×10⁻¹ W […]
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