Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 23

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Weekly Quiz Competition

Question 1
4 / -1

In the given diagram two long parallel wires carry equal currents in opposite directions. Point O is situated midway between the wires and the XY – plane contains the two wires and the positive Z – axis comes normally out of the plane of paper. The magnetic field B at O is non – zero along

A
XY and Z axis

B
X – axis

C
Y – axis

D
Z – axis
Question 2
4 / -1

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 fig. the loop will

A
rotate about an axis parallel to the wire

B
move away from the wire or towards right

C
move towards the wire

D
remain stationary
Question 3
4 / -1

Two particles X and Y having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describes circular path of radius R₁ and R₂ respectively. The ratio of mass of X to that of Y is

A
(R₁/R₂)^1/2

B
R₂/R₁

C
(R₁/R₂)²

D
R₁/R₂

Solution
Question 4
4 / -1

Two insulated rings, one of slightly smaller diameter than the other are suspended along their common diameter as shown. Initially the planes of the rings are mutually perpendicular. When a steady current is set up in each of them,

A
the two rings rotate into a common plane

B
the inner ring oscillates about its initial position

C
the inner ring stays stationary while the outer one moves into the plane of the inner ring.

D
The outer ring stays stationary while the inner one moves into the plane of the outer ring.
Question 5
4 / -1

A battery is connected between two points A and B on the circumference of a uniform conducting ring of radius r and resistance R. One of the arcs AB of the ring subtends an angle θ at the centre. The value of the magnetic induction at the centre due to the current in the ring is

A
proportional to 2 ( 180^o – θ)

B
inversely proportional to r

C
zero, only if θ =180^o

D
zero for all vales of θ
Question 6
4 / -1

A particle is moving in a uniform magnetic field then

A
its momentum changes but total energy remains the same

B
both momentum and total energy remains the same

C
both change

D
total energy changes but the momentum remains the same
Question 7
4 / -1

Two long parallel wires P and Q are held perpendicular to the plane of paper with distance of 5m between them. If P and Q carry current of 2.5 amp. And 5 amp. Respectively in the same direction, then the magnetic field at a point half – way between the wires is

A
μ₀/17

B

C
μ₀/2π

D
3μ₀/2π

Solution
Question 8
4 / -1

A cell is connected between the points A and C of a Circular conductor ABCD of centre O. ∠AOC = 60^o. If B₁ and B₂ are the magnitudes of the magnetic fields at O due to currents in ABC and ADC respectively, the ratio B₁/ B₂, is

A
6

B
5

C
1

D
1/5
Question 9
4 / -1

An infinitely long conductor PQR is bent to form a right angle as shown in fig. A current I flows through PQR. The magnetic field due to this current at the point M is H₁. Now another infinitly long straight conductor QS is connected at Q so that the current in I/2 in QR as well as in QS, the current in PQ remaining unchanged. The magnetic field at M is now H₂. The ratio H₁/H₂ is given by

A
1/2

B
1

C
2/3

D
2

Solution
Question 10
4 / -1

A particle of mass m and charge q moves with a constant velocity v along the positive x – direction. It enters a region containing a uniform magnetic field B directed along the negative z – direction, extending from x = a to x = b. the minimum value of v required so that the particle can just enter the region x > b is

A

B

C

D

Solution