The net electric force on a charge of +3μC at the mid-point on the line joining two charges of magnitude +2μC and -2μC seperated by the same distance of 6mm, is
Options
(a) 6000N […]
An Electric charge does not have which of the following properties?
Options
(a) Total charge conservation (b) Quantisation of charge (c) Two types of charge (d) Circular line of force
Correct Answer:
Circular line […]
The induced emf in a coil of 10 H inductance in which current varies from 9 A to 4 A in 0.2 s is
Options
(a) 200 V (b) 250 V (c) 300 V […]
The Davisson- Germer experiment is the direct evidence of
Options
(a) particle nature of electrons (b) wave nature of electrons (c) wave nature of light (d) particle nature of light
Correct Answer:
wave […]
Einstein’s photoelectric equation is
Options
(a) Emax=hν-φ (b) E=mc² (c) E²=p²c²+m₀²c⁴ (d) E=(1/2)mv²
Correct Answer:
Emax=hν-φ
Explanation:
No explanation available. Be the first to write the explanation for this question by commenting […]
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 […]
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. 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 […]
The Rutherford scattering experiment proves that an atom consists of
Options
(a) a sphere of positive charge in which electrons are embedded like seeds of water-melon (b) a sphere of negative charge in […]
If the alternating current I=I₁ cosωt+I₂ sinωt, then the rms current is given by
Options
(a) I₁+I₂/√2 (b) │I₁+I₂│/√2 (c) √(I₁²+I₂²/√2) (d) √I₁²+I₂²/√2
Correct Answer:
√(I₁²+I₂²/√2)
Explanation:
No explanation available. Be the first […]
2017 Copyright Doctor Dreams Training Academy