Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 24

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Weekly Quiz Competition

Question 1
4 / -1

Two long straight wires are set parallel to each other. Each carries a current I in the same direction and the separation between them is 2r. The intensity of magnetic field at a point P midway between them is

A

B

C
zero

D

Solution
Question 2
4 / -1

A wire carrying current I is shaped as shown in Fig. Section AB is quarter circle of radius r. the magnetic field is directed

A
along the bisector of the angle ACB away from AB

B
along the bisector of the angle ACB towards AB

C
perpendicular to the plane of paper and directed into the paper

D
at an angle π/4 to the plane of paper.
Question 3
4 / -1

Two long straight wires are set parallel to each other. Each carries a current I in the same direction and separation between them is 2r. magnitude of magnetic field midway between them is

A
μ₀I/r

B
zero

C
4μ₀I/r

D
μ₀I/4r
Question 4
4 / -1

Fig shows a conducting loop ADCA carrying current I and placed in a region of uniform magnetic field induction B₀. the part ADC forms a semicircle of radius R. The force on the semicircle part of the loop ADC is equal to

A
zero

B
πRIB₀

C
2 π RIB₀

D
2RI B₀
Question 5
4 / -1

A current carrying circular loop is placed in x – y plane fig. Magnetic field is switched in z – direction. The loop will

A
move towards + x

B
move towards – x

C
contracts

D
expands
Question 6
4 / -1

Electron, portion and α – particle are released perpendicular to a magnetic field with same kinetic energy. Then the radius of curvature of the circular path of

A
electron is maximum

B
α – particle is maximum

C
proton is maximum

D
proton and α-particle are same

Solution
Question 7
4 / -1

A
along ox

B
opposite to oy

C
along oy

D
opposite to ox

Solution
Question 8
4 / -1

A

B

C

D

Solution
Question 9
4 / -1

Three long straight parallel wires carrying currents, are arranged as shown in fig. The force experienced by a 25 cm length of wire C is

A
10^-3N

B
2.5 × 10^-3N

C
zero

D
1.5 × 10^-3N

Solution
Question 10
4 / -1

Electron of mass m and charge q is traveling with a speed of v along a circular path of radius r at right angles to a uniform magnetic field of intensity B. the speed of the electron is doubled and the magnetic field is halved, the resulting path would have a radius

A
2 r

B
4r

C
r/4

D
r/2

Solution