Physics class 12 project on kirchhoff's law . For making model- you have to make a cube using wire . When you finished making it just insert resistor in it. It's a delicate model so hand it with c...
Magnetic Field Lines of Bar Magnet
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All of the equations and formulas needed for Grade 12 University-evel Physics! (course code: SPH 4U0)
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The Free High School Science Texts: Textbooks for High School Students Studying the Sciences Physics Grade 12 Copyright c 2007 “Free High School Science Texts” Permission is granted t…Full description
class 12 th physics project
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Class 12 project for Physics. Class 12 cbse physics demonstration experiment. Physics experiment. second term. It is an experiment about logic Gates, which is given in the class 12 Physi…Full description
TO CONSTRUCT A PORTABLE MOBILE CHARGER WHICH SUPPLIES 7.5V TO CHARGE SAMSUNG GALAXY NOTE I. REMEMBER TO CHANGE THE NAME AND Pics FOR AUTHENTICATION. I ALSO SUBMITTED THIS PROJECT....
Magnetic Effects of Current 1. Tesla is the unit of (a) magnetic flux (b) magnetic field (c) magnetic induction (d) magnetic moment 2. A current carrying coil is subjected to a uniform magnetic field. The coil will orient so that its plane be Becomes (a) inclined at 450 to the magnetic field (b) inclined at any arbitrary angle to the magnetic field (c) parallel to the magnetic field (d) perpendicular to magnetic field 3. A deuteron of kinetic energy 50 keV is describing a circular orbit of radius 0.5 m in a plane Perpendicular to magnetic field B. the kinetic energy of the proton that describes a circular Orbit of radius 0.5 m in the same plane with the same B is (a) 25keV
(b) 50keV
(c) 200keV
(d) 100keV
4. The magnetic field at a distance r from a long wire carrying current i is 0.4 T. the magnetic Field at a distance 2r is (a) 0.2 T
(b) 0.8 T
(c) 0.1 T
(d) 1.6 T
5. To convert a galvanometer into an ammeter, one needs to connect a (a) low resistance in parallel (b) high resistance in parallel (c) low resistance in series (d) high resistance in series
6. At what distance from a long straight wire carrying a current of 12 A will the magnetic field Be equal to 3×10-5 wb/m2? (a) 8×10-2 m
(b) 12× 10-2 m
(c) 18×10-2 m
(d) 24×10-2 m
7. A 10 eV electron is circulating in a plane at right angles to a uniform field of magnetic Induction 10-4wb/m2 (=1.0 gauss). The orbital radius of the electron is (a) 12 cm
(b) 16 cm
(c) 11 cm
(d) 18 cm
8. Two equal electric currents are flowing perpendicular to each other as shown in the other AB and CD are perpendicular to each other and symmetrically placed with respect to the Current, where do we expect the resultant magnetic field to be zero? (a) on AB
I
(b) on CD
C
(c) on both AB and CD
A o
(d) on both OD and BO
B
I D
9. A galvanometer having a resistance of 8Ω is shunted by a wire of resistance 2Ω. If the total Current is 1 A, part of it passing through the shunt will be (a) 0.25A
(b) 0.8A
(c) 0.2A
(d) 0.5A
10. If a long hollow copper pipe carries a current, then magnetic field is produced (a) inside the pipe only (b) outside the pipe only (c) both inside and outside the pipe (d) no where
11. Dimensions of magnetic flux are: (a) (MLT-3 A2)
(b) (ML2T-2 A-1)
(C) (ML-2T2 A)
(d) (ML-2TA-1)
12. A copper wire of diameter 1.6 mm carries a current i. the maximum magnetic field due to This is 5×10-3 t. the value of I is: (a) 40A
(b) 5A
(c) 20A
(d) 2A
13. Ratio of magnetic field at the centre of a current carrying coil of radius R and at a distance of 3R on its axis is: (a) 10
(b) 20
(C) 2
(d)
14. A current carrying wire PQ is placed near an another long current carrying wire RS. If free to Move, wire PQ will have:
s
(a) translational motion only
i1
(b) rotational motion only
i2
(c) translational as well as rotational motion
p
(d) neither translational nor rotational motion
R
Q
15. A charged particle enters a magnetic field at right angles to the magnetic field. The filed exists for a Length equal to 1.5 times the radius of the circular path of the particle. The particle will be Deviated from its path by: (a) 900
(b) sin-1 (2/3)
(c) 30o
(d) 180o
16. Two long wires AB and CD carry currents i1 and i2 in the directions shown in figure: (a) force on wire AB is towards left
A
(b) force on wire AB is towards right (c) torque on wire AB is clockwise
i1 C
i2
(d) torque on wire AB is anticlockwise B
D
17. A conducting ring of mass 2 kg and radius 0.5 m is placed on a smooth horizontal plane. The Ring carries a current I = 4A.A horizontal magnetic field B = 10 T is switched on at time T=0 as shown in figure. The initial angular acceleration of the ring will be: (a) 40 π rad/s2
(b) 20 π rad/s2
(C) 5 π rad/s2
(d) 15 π rad/s2
B
18. In the figure shown a coil of single turn is wound on a sphere of radius R and mass m. the plane of The coil is parallel to the plane and lies in the equatorial plane of the sphere. Current in the coil is I The value of B if the sphere is in equilibrium is: (a)
(b)
(c)
(d)
B
19. The ratio of magnetic field at the centre of a current carrying circular coil to is magnetic moment Is x. if the current and radius both are doubled the new ratio will become : (a) 2x
(b) 4x
(c) x/4
(d) x/8
20. A particle having charge q enters a region of uniform magnetic field B (directed inwards) And is deflected as shown the magnitude of the momentum of the particle is: (a) (c)
(b) ( y2 + x) x
(d) qBy2
x
2x
y
21. A magnetic needle is kept in a non-uniform magnetic field. It experiences: (a) a force and a torque (b) a force but not a torque (c) a torque but not a force (d) neither a force non a torque 22. A conducting loop carrying a current I is placed in a uniform magnetic field pointing into the plane Of the paper as shown. The loop will have a tendency to: (a) contract
y
(b) expand (c) move towards + ve x-axis
x
(d) move towards –ve x-axis
1
23. A charge particle is released from rest in a region of steady and uniform electric and magnetic Field which are parallel to each other. The particle will move in a: (a) straight line
(b) circle
(c) helix
(d) cycloid
24. A circular loop of radius R, carrying current I, lies in x-y plane with its centre at origin. The total Magnetic flux through x-y plane is: (a) directly proportional to I
(b) directly proportional to R
(C) inversely proportional to R
(d) zero
25. Two particles x and y having equal charges, after being accelerated through the same potential Difference, enter a region of uniform magnetic field and describe circular paths of radii R1 and R2 respectively. The ratio of the mass of x to that of y is: (a) (R1/R2)1/2 (c) (R1/R2)2
(b) R2/R1 (d) R1/R2
26 A current I flows along the length of an infinitely long, straight, thin- walled pipe. Then: (a) the magnetic field at all points inside the pipe is the same, but not zero (b) the magnetic field at any point inside the pipe is zero
(c) the magnetic field is zero only on the axis of the pipe (d) the magnetic field is different at different points inside the pipe 27. A battery is connected between two pints A and B on the circumference of a uniform Conducting ring of radius r and resistance R. one of the arcs AB of the ring subtends an angle ѳ At the centre. The value of the magnetic induction at the centre due to the current in the ring is: (a) proportional to (180o-ѳ) (b) inversely proportional to r (c) zero, only if (ѳ = 180o) (d) zero for all values of ѳ 28. A magnetic needle is kept in a non-uniform magnetic field. It experiences (a) a force and a torqueω (b) a force but not a torque (c) a torque but not a force (d) neither a force nor a torque 29. A particle of charge q and mass m moves in a circular orbit of radius r with angular speed ω. The ratio of the magnitude of its magnetic moment to that of its angular momentum depends on (a) ω and q (b) ω, q and m (c) q and m (d) ω and m 30. The magnetic field of a given length of wire carrying a current for a single turn circular coil at Centre is B, then its value for two turns for the same wire when same current passing through It is (a) (c) 2B
