A ring is made of a nearly superconducting mate- rial. Inductance of the ring is `L = 0.5 H`. A current allowed to decay in the ring was observed to remain constant for a month. The instrument used to measure current could detect any change if it is greater than `1%`. Estimate the resistance of the ring considering it as a L R circuit with decaying current.
1 Answers
Talk Doctor Online in Bissoy App
The self-inductance of a solenoid of 600 turns is 108 mH. The self-inductance of a coil having 500 turns with the same length,
Option : (d) 75 mH
2 Answers 1 views
A `2^(@)C` rise in temperature is observed in a conductor passing a current. When the current is tripled. The rise in temperature will be
Correct Answer - 2 Heat developed in a conductor due to current =`I^(2)Rt`. Amount of heat energy in raising temperature of the conductor =mc`Deltatheta` Since, the heat developed in the conductor...
2 Answers 1 views
A superconducting loop of radius `R` has self inductance `L`.`A` uniform & constant magnetic field `B` is applied perpendicular to the plane of the lo
Correct Answer - B `epsilon=(dphi_(T))/(dt)=iR` as `R=0` for super conducting loop so `phi_(T)`=constant `BpiR^(2)+0=-BpiR^(2)-LI` `I=(2BpiR^(2))/L`
2 Answers 1 views
Show that if two inductors with equal inductance `L` are connected in parallel then the equivalent inductance of combination is `L//2`.The inductors a
Correct Answer - A::B `1/L_(eq)=1/L_(1)+1/L_(2)=1/L+1/L=2/L` or `L_(eq)=1/2`
2 Answers 1 views
Nuclei of `.^(64)Cu` can decay be electron capture (probability 61%) or by `beta^(+)` decay (39%). Half life of `.^(64)Cu` is 12.7 hour. Find the part
Correct Answer - 20.8hr.
2 Answers 1 views
Consider the nuclear decay reaction. `._(z)^(A)Xrarrunderset(z-1)AY+_(+)._(1)^(0)e+v` For the above `beta^(+)` decay reaction to the feasible what sho
Correct Answer - Twice the mass of an electron.
2 Answers 1 views
A radioactive nucleus A decays into B with a decay constnat `lambda_(1)`. B is alos radioactive and it decays into C with a decay constant of `lambda_
Correct Answer - (a)`(dN_(2))/(dt)=-lambda_(2)N_(2)+lambda_(1)N_(1)^(0)e^(-lambda_(1)t)` (b) `(A_(2))/(A_(1))=(lambda_(2))/(lambda_(2)-lambda_(1))` (c) `((1)/(lambda_(2)-lambda_(1)))ln((lambda_(2))/(lambda_(1)))`
2 Answers 2 views
Carbon (Z=6) with mass number 11 decays to boron (Z=5).(a) Is it a `beta^+` -decay? (b) the half-life of the decay scheme is 20.3 minutes .How much ti
Correct Answer - `[beta^(+), 64 min]`
2 Answers 1 views
Potassium-40 can decay in three modes .It can decay by `beta^(-)` - emission,`beta^(+)` -emission or electron capature. (a) Write the equation showing
Correct Answer - [(a) `._(19)^(40)K rarr ._(20)^(40)Ca + e^(-) + bar(v), ._(19)^(40)K rarr ._(18)^(40)Ar + e^(+) +v, ._(19)^(40)K + e^(-1) rarr ._(18)^(40)Ar+v` (b) 1.3034 MeV, 0.4676 MeV, 1.490 MeV]
2 Answers 1 views
M.P. of a saree is ₹ 1500. The shop owner allowed 25% discount, but the customer bargained for 30%.So, the shop owner allowed 25% and 5% successive di
Correct Answer - `₹21.25`
2 Answers 1 views