MCQ
Two wires of same length are shaped into a square and a circle. If they carry same current, ratio of the magnetic moment is
- A2 : π
- Bπ : 2
- ✓π : 4
- D4 : π
✓
Answer
Correct option: C.
π : 4
π : 4
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Consider an electron $\left(\mathrm{m}=9.1 \times 10^{-31} \mathrm{~kg}\right)$ confined by electrical forces to move between two rigid walls separated by $1.0 \times 10^{-9}$ metre, which is about five atomic diameters. The quantised energy value for the lowest stationary state is
→A $10\, \Omega, 20 \; mH$ coil carrying constant current is connected to a battery of $20 \; V$ through a switch is opened current becomes zero in $100 \; \mu s$. The average emf induced in the coil is $\dots \; V$.
→Which of the following are electromagnetic waves?
A block of mass M is hanging over a smooth and light pulley through a light string. T he other end of the string is pulled by a constant force F. The kinetic energy of the block increases by 20J in 1s.
Young’s double slit experiment is performed with light of wavelength $550 \,nm$. The separation between the slits is $1.10\, mm$ and screen is placed at distance of $1 \,m$. What is the distance between the consecutive bright or dark fringes.........$mm$
→A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are joined together. The power of the combination will be
In the Young's arrangement, screen starts moving towards right with constant speed $v$. Initial distance between screen and plane of slits is $x$. At $t=0$, 1st order maxima is lying at point A. After how much time first order minima lies at point $A$ ?
→A 1mm thick paper of dielectric constant $4$ lies between the plates of a parallel-plate capacitor. It is charged to $100$ volt the intensity of electric field between the plates of the condenser will be:
→A ray passes through a prism of angle 60° in minimum deviation position and suffers a deviation of 30°. What is the angle of incidence on the prism
Consider a photon of a continuous $X-$ray coming from a Coolidge tube. Its energy comes from:
→