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WorksheetsMoving charges and magnetism
Total questions: 20
Worksheet time: 13mins
In a certain region of space, electric field
E and magnetic field
B are perpendicular to each other. An electron enters perpendicularly to both the fields and moves undeflected. The velocity of electron is
E/B
B/E
E x B
E.B
A deuteron of kinetic energy 50 keV is describing a circular orbits of radius 0.5 m in a plane perpendicular to the magnetic field B. The kinetic energy of the proton that describes a circular orbit of same radius and inside same B is
25 keV
50 keV
200 keV
100 keV
A rectangular coil ABCD is placed near a long straight current carrying straight wire as shown. What is the net force on the rectangular coil?
25 x 10-7 N towards the wire
25 x 10-7 N away from the wire
35 x 10-7 N, towards the wire
35 x 10-7 N, away from the wire
To convert a moving coil galvanometer into on ammeter of given range, we must connect:
A suitable low resistance in series
A suitable low resistance in parallel
A suitable high resistance in parallel
A suitable high resistance in series
Two wires of same length are shaped into a square and a circle if they carry same current, ratio of magnetic moment is :
2 : pi
pi: 2
pi: 4
4:pi
Current sensitivity of a galvanometer can be increased by decreasing :
Magnetic field B
number of turns N
torsional constant K
Area A
An electric current passes through a long straight copper wire. At a distance 5 cm from the straight wire, the magnetic field is B. The magnetic field at 20 cm from the straight wire would be
B/6
B/4
B/3
B/2
A wire in the form of a circular loop, of one turn carrying a current, produces magnetic induction B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is
B
2B
4B
8B
Currents of 10 A and 2 A are flowing in opposite directions through two parallel wires A and B respectively. If the wire A is infinitely long and wire B is 2 m long, then force on wire B which is situated at 10 cm from A, is
8 x 10 ^ -5 N
6 x 10 ^-5 N
4 x 10 ^ -5 N
2 X 10 ^ -5 N
A 100 turns coil shown in the figure carries a current of 2 A in a magnetic field of .2Wbm2 The torque acting on the coil is
0.32 N-m tending to rotate the side AC into the page
0.32 N-m tending to rotate the side AC out of the page
0.64 N-m tending to rotate the side AC into the page
0.64 N-m tending to rotate the side AC out of the page
To convert a moving coil galvanometer into on ammeter of given range, we must connect:
A suitable low resistance in series
A suitable low resistance in parallel
A suitable high resistance in parallel
A suitable high resistance in series
A solenoid has 1000 turns per metre length. If a current of 5A is flowing through it, then magnetic field inside the solenoid is
2 PIE 10-3 T
2 PIE 10-5 T
4 PIE 10-3 T
4 PIE 10-5 T
What is the equation for the force on a moving charge
F=qvB
F=qv/B
9.8 N/kg
None of the above
A positive charge is moving to the left through a magnetic field that is going into the page. What is the direction of the force on the charge?
Up
Down
Into the page
Out of the page
No Force
A current (I) is moving through a wire in the upward direction through a magnetic field directed to the right. What is the direction of the force on the wire?
Up
Down
Into the page
Out of the page
No Force
correct unit of magnetic field is
(a) Amperes
(b) Tesla
(c) Newton
(d) coulombs ampere turns
what is common to both biot savart law and ampere's law
(a) Both relate the magnetic field and the current, and both express the same physical consequences of a varying electrical current
(b) Both relate the magnetic field and the current, and both express the same physical consequences of a steady electrical current
(c) Both relate the magnetic field and the current density, and both express the same physical consequences of a steady electrical current
(d) nothing in common
The strongest part of a magnet is...
