Magnetic Effect of Electric Current

Quiz by Indira Menon

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- Q1
Biot-Savart law indicates that the moving electrons (velocity v) produce a magnetic field B such that

B || v

B ⊥ v

it is along the line joining the electron and point of observation

it obeys inverse cube law

60s - Q2
Two charged particles traverse identical helical paths in a completely opposite sense in a uniform magnetic field B = B

_{0}*k*.They have equal z-components of momenta

They must have equal charges

They necessarily represent a particle- antiparticle pair

The charge to mass ratio satisfy: (e/m)

_{1}+(e/m)_{2}=060s - Q3
A circular coil of radius 4 cm and of 20 turns carries a current of 3 amperes. It is placed in a magnetic field of intensity of 0.5 weber/m². The magnetic dipole moment of the coil is(a) (b) (c)

0.45 ampere-m²

0.3 ampere-m²

0.6 ampere-m²

0.15 ampere-m²

60s - Q4
The conversion of a moving coil galvanometer into a voltmeter is done by

introducing a resistance of small value in parallel

introducing a resistance of large value in parallel

introducing a resistance of small value in series

introducing a resistance of large value in series.

60s - Q5
An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is true?

The electron will experience a force at 45° to the axis and hence execute a helical path.

The electron will be accelerated along the axis.

The electron path will be circular about the axis.

The electron will continue to move with uniform velocity along the axis o fthe solenoid

60s - Q6
In a cyclotron, a charged particle

speeds up between the dees because of the magnetic field.

undergoes acceleration all the time.

speeds up in a dee.

slows down within a dee and speeds up between dees.

60s - Q7
If a charged particle moves through a magnetic field perpendicular to it

momentum is constant but energy changes.

energy is constant but momentum changes.

momentum as well as energy are constant.

both momentum and energy of particle change.

60s - Q8
A circular current loop of magnetic moment M is in an arbitrary orientation in an external magnetic field B. The work done to rotate the loop by 30° about an axis perpendicular to its plane is

zero

MB

MB2

√3MB2

60s - Q9
A rectangular loop carrying a current i is situated near a long straight wire such that the wire is parallel to the one of the sides of the loop and is in the plane of the loop. If a steady current I is established in wire as shown in figure, the loop will

move towards the wire.

rotate about an axis parallel to the wire.

remain stationary.

move away from the wire or towards right.

60s - Q10
A cubical region of space is filled with some uniform electric and magnetic fields. An electron enters the cube across one of its faces with velocity v and a positron enters via opposite face with velocity -v. At this instant,

the magnetic forces on both the particles cause equal accelerations.

Only electron gains or looses energy.

the electric forces on both the particles cause identical accelerations.

the motion of the centre of mass (CM) is determined by E alone.

60s - Q11
Consider a wire carrying a steady current, I placed in a uniform magnetic field B perpendicular to its length. Consider the charges inside the wire. It is known that magnetic forces do not work. This implies that,

If the wire moves under the influence of B, no work is done by the electric force on the ions, assumed fixed within the wire.

motion of charges inside the conductor is unaffected by B, since they do not absorb energy.

if the wire moves under the influence of B, no work is done by the force.

Some charges inside the wire move to the surface as a result of B.

60s - Q12
The maximum current that can be measured by a galvanometer of resistance40 Ω is 10 mA. It is converted into voltmeter that can read upto 50 V. The resistance to be connected in the series with the galvanometer is

4960 Ω

2010 Ω

5040 Ω

4050 Ω

60s - Q13
Two identical current carrying coaxial loops, carry current I in an opposite sense. A simple amperian loop passes through both of them once. Calling the loop as C,

B vanishes everywhere on C.

the value of ∮CB.dl is independent of sense of C. c

there may be a point on C where, B and dl are parallel

∮CB.dl = ± 2µ

_{0}I60s - Q14
The strength of magnetic field at the centre of circular coil is

60s - Q15
A current carrying closed loop of an irregular shape lying in more than one plane when placed in uniform magnetic field, the force acting on it(a) (b) (c)(d)

may or may not be zero.

is zero.

will be more in the plane where its larger position is covered.

is infinite.

60s