What is the nature of Gaussian surface involved in Gauss’s law of electrostatics?
Options
(a) scalar (b) electrical (c) Magnetic (d) Vector
Correct Answer:
Vector
Explanation:
The Gauss’s law in electrostatics gives a relation […]
what is the electric potential at a distance of 9cm from 3nC?
Options
(a) 270V (b) 3V (c) 300V (d) 30V
Correct Answer:
300V
Explanation:
Given, q = 3 nC = 3 × 10⁻⁹ […]
Two equal and opposite charges of masses m₁ and m₂ are accelerated in a uniform electric field through the same distance. What is the ratio of their accelerations, if their ratio of masses is m₁/m₂=0.5? […]
If a charge on the body is 1nC, then how many electrons are present on the body?
Options
(a) 1.6×10¹⁹ (b) 6.25×10⁹ (c) 6.25×10²⁷ (d) 6.25×10²⁸
Correct Answer:
6.25×10⁹
Explanation:
No explanation available. […]
If α (current gain) of transistor is 0.98, then what is the value of β (current gain) of the transistor?
Options
(a) 0.49 (b) 49 (c) 4.9 (d) 5
Correct Answer:
49
Explanation: […]
In n-type semiconductor, electrons are majority charge carriers but it does not show any negative charge. The reason is
Options
(a) electrons are stationary (b) electrons neutralise with holes (c) mobility of electrons […]
The maximum kinetic energy of the photoelectrons depends only on
Options
(a) Charge (b) frequency (c) incident angle (d) pressure
Correct Answer:
frequency
Explanation:
No explanation available. Be the first to write the […]
what is the de-Broglie wavelength of the electron accelerated through a potential difference of 100V?
Options
(a) 12.27Å (b) 1.227Å (c) 0.1227Å (d) 0.001227Å
Correct Answer:
1.227Å
Explanation:
No explanation available. Be the […]
In potentiometer experiment, a cell of emf 1.25V gives balancing length of 30 cm. If the cell is replaced by another cell, then balancing length is found to be 40cm. What is the emf of […]
Two resistors of resistances 2Ω and 6Ω are connected in parallel. This combination is then connected to a battery of emf 2V and internal resistance 0.5Ω. What is the current flowing through the battery?
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