KCET · Physics · Alternating Current
A solenoid of inductance \( 2 \mathrm{H} \) carries a current of \( 1 \mathrm{~A} \). What is the magnetic energy stored in a solenoid?
- A \( 12 \mathrm{~J} \)
- B \( 1 \mathrm{~J} \)
- C (1)
- D \( 05 \mathrm{~J} \)
Answer & Solution
Correct Answer
(B) \( 1 \mathrm{~J} \)
Step-by-step Solution
Detailed explanation
Energy stored in a solenoid is given as
\(E=\frac{1}{2} L I^{2}\)
Given, inductance of solenoid, \( \mathrm{L}=2 \mathrm{H} \); current in solenoid, \( \mathrm{I}=1 \mathrm{~A} \)
Therefore \( E=\frac{1}{2} \times 2 \times 1^{2}=1 \)
Thus, energy stored in solenoid = \( 1 \mathrm{~J} \)
\(E=\frac{1}{2} L I^{2}\)
Given, inductance of solenoid, \( \mathrm{L}=2 \mathrm{H} \); current in solenoid, \( \mathrm{I}=1 \mathrm{~A} \)
Therefore \( E=\frac{1}{2} \times 2 \times 1^{2}=1 \)
Thus, energy stored in solenoid = \( 1 \mathrm{~J} \)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- Two spheres carrying charges \( +6 \mu \mathrm{C} \) and \( +9 \mu \mathrm{C} \). separated by a distance \( \mathrm{d} \), experiences a
force of repulsion \( F \). When a charge of \( -3 \mu \mathrm{C} \) is given to both the sphere and kept at the same
distance as before, the new force of repulsion isKCET 2015 Medium - The refraction through the prisms are as shown. Pick out the wrong statement from the following. Path of the light ray in
KCET 2013 Easy - A car is moving in a circular horizontal track of radius \(10 \mathrm{~m}\) with a constant speed of \(10 \mathrm{~ms}^{-1}\). A bob is suspended from the roof of the car by a light wire of length \(1.0 \mathrm{~m}\). The angle made by the wire with the vertical is (in rad)KCET 2022 Medium
- A jet plane of wing span \( 20 \mathrm{~m} \) is travelling towards west at a speed of
\( 400 \mathrm{~ms}^{-1} \). If the earth's total magnetic field is \( 4 \times 10^{-4} \mathrm{~T} \) and the dip angle is \( 30^{\circ} \), at that
place, the voltage difference developed across the ends of the wing isKCET 2017 Easy - A certain prism is found to produce a minimum deviation of \( 38^{\circ} . \) It produces a deviation of \( 44^{\circ} \)
when the angle of incidence is either \( 42^{\circ} \) or \( 62^{\circ} \). What is the angle of incidence when it is
undergoing minimum deviation?KCET 2019 Easy - A physical quantity \( \mathrm{Q} \) is found to depend on observable \( \mathrm{x}, \mathrm{y} \) and \( \mathrm{z} \), obeying relation \( Q=\frac{x^{3} y^{2}}{z} \). The percentage error in the measurements of \( x, y \) and \( z \) are \( 1 \%, 2 \% \) and \( 4 \% \) respectively. What is percentage error in the quantity \( \mathrm{Q} \) ?KCET 2014 Medium
More PYQs from KCET
- For Freundlich isotherm a graph of \( \log \frac{x}{m} \) is plotted against log \( P \). The slope of the line and its
\( y \)-axis intercept, respectively corresponds toKCET 2014 Easy - Which one of the following is not a common component of photo-chemical smog?KCET 2017 Easy
- Amplitude modulation hasKCET 2015 Easy
- If \(f: R \rightarrow R\) is defined by \(f(x)=|x|\), thenKCET 2007 Easy
- rop gene which codes for the proteins involved in the replication of the plasmid pBR322 in E. coli is located at restriction site ofKCET 2021 Medium
- The de-Broglie wavelength of a particle of kinetic energy \(K\) is \(\lambda\), the wavelength of the particle, if its kinetic energy \(\frac{K}{4}\) isKCET 2022 Easy