The temperature coefficient of the resistance of a wire is 0.00125 per ⁰C.
The temperature coefficient of the resistance of a wire is 0.00125 per ⁰C. At 300 K its resistance is 1Ω. The resistance of wire will be 2Ω at
Options
(a) 1154K (b) 1100K […]
Physics
The electron drift speed is small and the change of the electron is also small
The electron drift speed is small and the change of the electron is also small but still, we obtain large current in a conductor. This is due
Options
(a) the conducting property of […]
A silver wire of radius 0.1 cm carries a current of 2A. If the charge density in silver
A silver wire of radius 0.1 cm carries a current of 2A. If the charge density in silver is 5.86×10²⁸ m⁻³, then the drift velocity is
Options
(a) 0.2×10⁻³ ms⁻¹ (b) 0.4×10⁻⁴ ms⁻¹ […]
An electron revolves in a circle at the rate of 10¹⁹ rounds per second.
An electron revolves in a circle at the rate of 10¹⁹ rounds per second. The equivalent current is (e=1.6×10⁻¹⁹C)
Options
(a) 1.0A (b) 0.2A (c) 0.1A (d) 2.0A
Correct Answer:
0.2A
Explanation:
Current I […]
When a wire of uniform cross-section a, length l and resistance R
When a wire of uniform cross-section a, length l and resistance R is bent into a complete circle, resistance between any two of diametrically opposite points will be
Options
(a) R/4 (b) 4R […]
The resistances of the four arms P,Q,R and S in a Wheatstone’s bridge
The resistances of the four arms P,Q,R and S in a Wheatstone’s bridge are 10Ω, 30Ω, 30Ωand 90Ω respectively. The emf and internal resistance of the cell are 7V and 5Ω, respectively. If the galvanometer […]
When 4 A current flows for 2 min in an electroplating experiment,
When 4 A current flows for 2 min in an electroplating experiment, then m gram of silver is deposited. Then the amount (in gram) of silver deposited by 6 A current flowing for 40 s […]
In India, electricity is supplied for domestic use at 200V. It is supplied at 110 V
In India, electricity is supplied for domestic use at 200V. It is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in India is R, the resistance of […]
In a potentiometer experiment, the balancing with a cell is at length 240 cm.
In a potentiometer experiment, the balancing with a cell is at length 240 cm. On shunting the cell with a resistance of 2Ω , the balancing becomes 120 cm. The internal resistance of the cell […]
Potentiometer measures the potential difference more accurately than a voltmeter
Potentiometer measures the potential difference more accurately than a voltmeter because
Options
(a) it does not draw current from external circuit (b) it draws a heavy current from external circuit (c) it has […]