Worksheetsquiz on E.M induction and magnetism
Total questions: 25
Worksheet time: 31mins
Find the direction of the magnetic force on the charge (+q), the direction of the B is down ward in the plain of screen, and q is horizontally shot towards
Into the screen
Out of the screen
Right
Left
If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushed into a coil with twice the number of loops,
a. one-half as much voltage is induced.
b. the same voltage is induced.
c. twice as much voltage is induced.
d. four times as much voltage is induced.
Based on this picture, which side will have a higher voltage?
Secondary
Primary
Both sides have the same voltage
Cannot be determined
A coil spins in a magnetic field. Of the following which causes an increase in the induced EMF in the coil?
Spinning the coil faster
Removing the coil from the magnetic field
Keeping the flux at a constant rate
Decreasing the number of turns of wire in
the coil
Magnetic flux is related to magnetic field strength by the formula
Φ=BA
Φ=BA2
Φ=B/A
Φ=B/A2
When a charged particle moving with velocity v enters a magnetic field at right angles it will be forced into a circular path with radius r given by
mv/Bq
Bq/mv
mv2/Bq
none of these
The size of the force exerted on a moving charge relative to an external magnetic field is given by
Bqv
Bqvcosθ
Bqvsinθ
none of these
A uniform magnetic field of strength 4 mT is used to deflect a beam of electrons into a circular path of diameter 65 mm. Calculate the speed of the electrons
2.3x107ms-1
4.6x107ms-1
3.0x107ms-1
2.0x107ms-1
F = BIL If the current and magnetic field are doubled, the magnetic force on the wire
halves
remains the same
doubles
quadruples
Which activity will produce the highest current?
Move the magnet bar into the coil while the coil remains stationery
Move the coil into the magnet bar while the magnet remains stationery
Move the coil and magnet towards each other
Move the coil and magnet away from each other
The mutual inductance M12 of coil 1 with respect to coil 2
(a) increases when they are brought nearer.
(b) depends on the current passing through the coils.
(c) increases when one of them is rotated about an axis.
(d) is the same as M21 of coil 2 with respect to coil 1
A steady electric current is flowing through a cylindrical conductor
The electric field at the axis of the conductor is zero.
The magnetic field at the axis of the conductor is zero.
The electric field in the vicinity of the conductor is zero.
The magnetic field in the vicinity of the conductor is Zero
The auroras are created when particles from the ________ crash into and mix with gases in Earth's upper atmosphere.
Sun and stars
Hazardous emission from car
Meteors
Volcano
A galvanometer of 50 Ω gives full scale deflection with 2mA current. To convert it into ammeter, the range of 10 A is connected with it. What is the required value of shunt?
0.1 Ω
0.2 Ω
0.01 Ω
0.02 Ω
A moving coil galvanometer has N number of turns in a coil of effective area A, it carries a current I. The magnetic field B is radial. The torque acting on the coil is
NA2B2I
NABI2
N2ABI
NABI
Formula for figure of merit of galvanometer is ________ (depending on the Practical performed last saturday)
(R−G)θk
(R+G)θk
RXG
(R X S ) - G
