Two wires of equal length and equal diameter and having resistivities ρ₁ and ρ₂ are connected in series. The equivalent resistivity of the combination is
Options
(a) ρ₁+ρ₂/2 (b) ρ₁+ρ₂ (c) ρ₁ρ₂/ρ₁+ρ₂ (d) √ρ₁ρ₂
The slope of the graph showing the variation of potential difference V on X-axis and current Y-axis gives conductor
Options
(a) resistance (b) resistivity (c) reciprocal of resistance (d) conductivity
Correct Answer:
reciprocal […]
The resistance of a carbon resistor of colour code Red-Red Green Silver is (in kΩ)
Options
(a) 2200±5% (b) 2200±10% (c) 220±10% (d) 220±5%
Correct Answer:
2200±10%
Explanation:
Given, Colour coding of resistance = […]
Number of electrons in one mC charge, given e=1.6×10⁻¹⁹ C, will be
Options
(a) 6.25×10¹⁷ (b) 6.25×10¹⁵ (c) 1.6×10⁻¹⁶ (d) 1.8×10⁻¹⁶
Correct Answer:
6.25×10¹⁵
Explanation:
No explanation available. Be the first to write […]
When the rate of flow of charge through a metallic conductor of non-uniform cross-section is uniform, then the quantity that remains constant along the conductor is
Options
(a) current density (b) electric field […]
The current flowing through a lamp marked as 50 W and 250 V is
Options
(a) 5A (b) 2.5A (c) 2A (d) 0.2A
Correct Answer:
0.2A
Explanation:
No explanation available. Be the first […]
Identify the wrong statement
Options
(a) Charge is a vector quantity (b) current is a scalar quantity (c) Charge can be quantised (d) Charge is additive in nature
Correct Answer:
Charge is a […]
The range of voltmeter is 10V and its internal resistance is 50Ω. To convert it to a voltmeter of range 15V, how much resistance is to be added?
Options
(a) Add 25Ω resistor is […]
How much work is required to carry a 6 μC charge from the negative terminal to the positive terminal of a 9V battery?
Options
(a) 54×10⁻³ J (b) 54×10⁻⁶ J (c) 54×10⁻¹⁹ J (d) […]
In a potentiometer experiment two cells of e.m.f. E₁ and E₂ are used in series and in conjunction and the balancing length is found to be 58 cm of the wire. If the polarity of […]
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