Any doubt then message and contact me.

Name: -
NB COACHINGS (Physics)
Excellence in Education Class : -
CBSE PMT, IIT JEE/MAINS

PHYSICS: MAGNETIC EFFECT AND MAGNETISM
PHYSICS Q6. Electron is moving perpendicular to z-axis; the
Q1. An electron having charge 1.6  1019 C and magnetic field B0 is present along the z-axis; the
mass 9 x 1031 kg is moving with 4  106 m/s radius of circular path is a. Angular momentum
speed in a magnetic field of 2  101 tesla in a is
circular orbit. The force acting on an electron (a) e B0a2 (b) 0
and the radius of circular orbit will be (c) e2 B02 a2 (d) e B0a
(a) 1.28 x 1014 N, 1.1 x 10-3 m Q7. An -particle crosses a space without any
(b) 1.28 x 1015 N, 1.2 x 1012 m deflection. If electric field E = 8  106 V/m and
(c) 1.28 x 103 N, 1.1 x 104 m magnetic field is B = 1.6 T, the velocity of
(d) None of these particle is
Q2. In a cyclotron, if a deuteron can gain an energy (a) 2.5  106 m/s (b) 5  106 m/s
of 40 MeV, then a proton can gain an energy of (c) 8  106 m/s (d) 5  107 m/s
(a) 40 MeV (b) 80 MeV Q8. A beam of cathode rays is subjected to crossed
(c) 20 MeV (d) 60 MeV electric (E) and magnetic fields (B). The fields
Q3. The ratio of time period of  particle to that of are adjusted such that the beam is not
proton circulating with same speed in the same deflected. The specific charge of the cathode
uniform magnetic field is rays is given by (where V is the potential

(a) :1 (b) 1 : difference between cathode and anode.

(c) 1 : 2 (d) 2 : 1
Q4. A proton and an -particle enter a uniform (a) (b)

magnetic field perpendicular to y-axis with the
same speed. If proton takes 25 sec to make 5 (c) (d)

revolutions, then time period for the -particle Q9. A certain electric motor wire that carries a

would be current of 4 amp is perpendicular to a magnetic

(a) 5 sec (b) 10 sec field of 0.8 T. What is the force on each cm of

(c) 25 sec (d) 50 sec the wire?

Q5. Mass of proton is 1.6 x 10 27 kg. The proton (a) 0.08 N (b) 0.06 N

enters the magnetic field of 2T at an angle 30 o (c) 0.04 N (d) 0.02 N

with direction of field. The velocity of proton is Q10. A wire of length l carries a current i along x-
2 x 107 m/s. The radius of the path described by axis. A magnetic field exists given by B = B 0

proton is
T. The magnitude of the magnetic
(a) 3 cm (b) 4 cm
force acting on the wire is
(c) 5 cm (d) 6 cm
(a) iIB0 (b) iIB0
SCO 372, Top Floor (Above Golden Bakery), Sec. 37-D, Chandigarh. M.: 9872261688 1
SCO. 61, Top Floor, Sector 20-C, Chandigarh

, Name: -
NB COACHINGS (Physics)
Excellence in Education Class : -
CBSE PMT, IIT JEE/MAINS
(c) 2ilB0 (d) ilB0 (a) a voltmeter is connected in parallel and

Q11. What is the magnitude of magnetic force per current through it is negligible

until length of a wire carrying a current of 5A (b) an ammeter is connected in parallel and

and making an angle 30o with direction of a potential difference across it is small

uniform magnetic field of 0.1 T? (c) a voltmeter is connected in series and

(a) 0.25 Nm (b) 0.45 Nm potential difference across it is small

(c) 0.35 Nm (d) 0.55 Nm (d) an ammeter is connected in series in a

Q12. Two parallel wires of length 9 m each are circuit and the current through it is negligible

separated by a distance 0.15 m. If they carry Q16. For the magnetic field to be maximum due to a
equal currents in the same direction and exert small element of current carrying conductor at

a total force of 30  107 N on each other, then a point, the angle between the element and

the value of current must be the line joining the element to the given point

(a) 2.5 amp (b) 3.5 amp must be

(c) 1.5 amp (d) 0.5 amp (a) 0oA (b) 90o

Q13. In the given figure, the loop is fixed but straight (c) 180oA (d) 45o

wire can move. The straight wire will Q17. Magnetic field at the centre of a current
carrying circular loop having 1 A current and
number of turns one will be (radius of the loop
is 1 m)


(a) remain stationary (a) (b)
(b) move towards the loop
(c) move away from the loop (c) (d) 40
(d) rotate about the axis Q18. The magnetic field intensity due to a thin wire
2
Q14. A circular loop of area 0.01 m carrying a carrying current I in the figure shown is
current of 10 A, is held perpendicular to a
magnetic field of intensity 0.1 T. The torque
acting on the loop is
(a) zero (b) 0.001 Nm
(c) 0.01 Nm (d) 0.8 Nm (a)
Q15. A sensitive galvanometer like a moving coil
galvanometer can be converted into an (b)
ammeter or a voltmeter by connecting a proper
resistance to it. Which of the following (c)

statements is true?
(d)

SCO 372, Top Floor (Above Golden Bakery), Sec. 37-D, Chandigarh. M.: 9872261688 2
SCO. 61, Top Floor, Sector 20-C, Chandigarh