1
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
To which of the following quantities, the radius of the circular path of a charged particle moving at right angles to a uniform magnetic field is directly proportional?
A
energy of the particle
B
magnetic field
C
charge of the particle
D
momentum of the particle
2
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
An electric current 'I' enters and leaves a uniform circular wire of radius r through diametrically opposite points. A particle carrying a charge q moves along the axis of the circular wire with speed v. What is the magnetic force experienced by the particle when it passes through the centre of the circle?
A
$$qv{{{\mu _0}i} \over a}$$
B
$$qv{{{\mu _0}i} \over {2a}}$$
C
$$qv{{{\mu _0}i} \over {2\pi a}}$$
D
Zero
3
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
A current 'I' is flowing along an infinite, straight wire, in the positive Z-direction and the same current is flowing along a similar parallel wire 5 m apart, in the negative Z-direction. A point P is at a perpendicular distance 3m from the first wire and 4m from the second. What will be magnitude of the magnetic field B of P?
A
$${5 \over {12}}({\mu _0}I)$$
B
$${7 \over {24}}({\mu _0}I)$$
C
$${5 \over {24}}{{{\mu _0}I} \over \pi }$$
D
$${{25} \over {288}}({\mu _0}I)$$
4
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
A square conducting loop is placed near an infinitely long current carrying wire with one edge parallel to the wire as shown in the figure. If the current in the straight wire is suddenly halved, which of the following statements will be true?

WB JEE 2019 Physics - Magnetism Question 25 English
"The loop will .........".
A
stay stationary
B
move towards the wire
C
move away from the wire
D
move parallel to the wire
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