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 […]
If a wire is stretched to four times its length, then the specific resistance of the wire will
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(a) become 4 times (b) become 1/4 times (c) become 16 times (d) remain the […]
A potentiometer wire of length 10 m and resistance 10 Ω per metre is connected in series with a resistance box and a 2 volt battery. If a potential difference of 100mV is balanced across […]
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