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Quiz 67
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1321. Which of the following statement is true about the magnetic field inside a solenoid?
It is along the axis of the coil
It is strongest at the ends of solenoid
It is circular around the wires
It is zero when current flows through it
1322. When currents are flowing through two long wires in same direction, electric field between them is:
Strong
Weak
Remains same
Infinite
1323. Unit of magnetic permeability of free space is:
T•m
Henry/m
Volt
T•mA⁻¹
1324. Unit of magnetic flux is:
Tesla
Weber
Volt
Weber•m⁻²
1325. Magnetic flux through Earth is:
Strong
Weak
Zero
100
1326. The magnetic field of Earth at its surface is:
2 Gauze
½ Gauze
¼ Gauze
2.5 Gauze
1327. Magnetic force depends upon:
Current
Length
Magnetic field
All of above
1328. S.I unit of magnetic flux is weber (Wb). In terms of S.I base units, weber can be written as:
NmA
Nm⁻¹A
Nm⁻¹A⁻¹
NmA⁻¹
1329. Magnetic flux will be maximum when the angle:
Is 0° between B and area vector
Is 90° between B and area vector
Is 45° between B and area vector
Is 60° between B and area vector
1330. The magnetic field inside the current carrying wire varies:
inversely with r
inversely with r²
directly with r²
directly with r
1331. The weber is a unit of measure of:
Conductance
Electric current
Magnetic flux
Electric flux
1332. The wire of length 100 cm is perpendicular to the magnetic field of 0.5 T. If wire carries 10 A of current then force acting on the wire will be:
50 N
25 N
10 N
5 N
1333. e/m of electron is given by the relationship:
e/m = 2(V/B²r²)
e/m = (V/Br)²
e/m = V/rB
e/m = VB/r
1334. A neutron having mass equal to a proton (mₚ = 1.6 × 10⁻²⁷ kg) is moving in a magnetic field of intensity 1.2 × 10⁻³ T with a speed of 2 × 10⁷ m/s. What is the maximum force experienced by the neutron?
3.84 × 10⁻¹⁵ N
0
3.84 × 10⁻¹² N
38.4 × 10⁻¹⁵ N
1335. Electric forces change the magnitude and direction of velocity while magnetic forces change ------- of velocity.
Only magnitude
Only direction
Magnitude and direction
Neither magnitude and direction
1336. A proton of charge 1.6 × 10⁻¹⁹ C is moved through a potential difference of 20 V. The energy gained by the proton is:
-32 × 10⁻¹⁹ J
32 × 10⁻¹⁹ J
-32 × 10⁻¹⁸ J
32 × 10⁻¹⁸ J
1337. A magnetic field exerts a force on a charged particle:
If the particle moving across the field lines
If the particle moving along the field lines
If the particle is at rest
Always experience force
1338. The force exerted on charged particle will maximum when it enters the magnetic field at:
60°
90°
0°
45°
1339. When a charged particle enters the magnetic field parallel, then it will:
deflect toward north
deflect toward south
Move straight
in circular path
1340. A charged particle entered in a magnetic field anti-parallel to the field, magnetic force on this particle is:
BINA
Bev sin θ
Zero
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