Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 22

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Weekly Quiz Competition

Question 1
4 / -1

A straight conductor carrying a direct current i amp. is split into circular loop as shown in Fig. Then the magnetic induction at the centre of the circular loop of radius r meter is

A
0

B
∞

C

D
Question 2
4 / -1

An infinite long straight conductor is bent into the shape as shown in the fig. It carries a current of I ampere and the radius of the circular loop is r metre. Then the magnetic induction at its centre will be

A
Zero

B
Infinite

C

D

Solution
Question 3
4 / -1

Equal current I flows in two segments of a circular loop in the direction shown in Fig. Radius of the loop is r. The magnitude of magnetic field induction at the centre of the loop is

A
zero

B

C

D

Solution
Question 4
4 / -1

There is a magnetic field acting in a plane downward perpendicular to sheet of paper. Particles in vacuum move in the plane of paper from left to right.The path indicated by a particle could be traveled by

A
proton

B
neutron

C
electron

D
α particle
Question 5
4 / -1

The electric field in the space between the plates of a discharge tube is 3.25 × 10⁴ newtons/coulomb. If the mass of a proton is 1.67 × 10^-27 kg and its charge is 1.60 × 10^-19 coulomb, the force of the electric field on a proton in this field is

A
10.40 × 10^-15 newtons

B
10.40 × 10^-16 newtons

C
2.0 × 10^-16 newtons

D
5.20 × 10^-15 newtons.

Solution
Question 6
4 / -1

A

B

C
it always possesses circular motion

D
it can go undeflected also
Question 7
4 / -1

A loosely wound helix made of stiff wire is mounted vertically with the lower end just touching a dish of mercury. When a current from a battery is started in the coil through the mercury

A
the wire oscillates

B
the wire continues making contact

C
the wire breaks contact just as current is passed

D
The mercury will expand by heating due to passage of current.
Question 8
4 / -1

A current I₁ carrying wire AB is placed near an another long wire CD carrying current I₂. Fig If free to move, wire AB will have

A
rotational motion only

B
translational motion only

C
rotational as well as translational motion

D
neither rotational nor translational motion

Solution
Question 9
4 / -1

A candidate connects a moving coil ammeter A and a moving coil voltmeter V and a resistance R as shown in Fig.If the voltmeter reads 20 volt and the ammeter reads 4 ampere, then R is

A
equal to 5 ohms

B
greater than 5 ohms

C
less than 5 ohms

D
greater or less than 5 ohms depending upon its material.
Question 10
4 / -1

The coil of a sensitive moving coil galvanometer swings uncontrollably. This movement can be stopped rapidly by

A
connecting a large resistance across the ends of the coil

B
holding a magnet near to the coil

C
connecting a short length of copper wire across the ends of the coil

D
earthing the case of the instrument