When a charged particle moving with velocity v → is subjected to a magnetic field of induction B → , the force on it is non-zero. This implies that

angle between v → and B → can have any value other than zero and 180 °

angle between v → and B → is either zero or 180 °

angle between v → and B → is necessarily 90 °

angle between v → and B → can have any value other than 90 °

B experience a net clockwise torque.

B experiences a net force along + x axis.

B experiences a net anticlockwise torque.

B experiences a net force along - x axis.

The force acting on a current carrying wire joining two fixed points A and B in a uniform magnetic field

is independent of the shape of the wire

increases exponentially with increase in current

is inversely proportional to the magnitude of the magnetic field

is parallel to the direction of the magnetic field

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Three long straight wires $A, B$ and $C$ are carrying currents as shown in the figure. The resultant force on $B$ is directed,

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Important Questions on Magnetic Effects of Current and Magnetism

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 3>Q 12

A horizontal rod of mass

0.01 kg

and length

10 cm

is placed on a frictionless plane inclined at an angle

60 °

with the horizontal and with the length of the rod parallel to the edge of the inclined plane. A uniform magnetic field is applied vertically downwards. If the current through the rod is

1.73 A

, then the value of magnetic field induction

B

for which the rod remains stationary on the inclined plane is

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 3>Q 13

$P, Q$ and $R$ are long parallel straight wires in air carrying currents as shown. The direction of the resultant force on $R$ is,

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 3>Q 14

Ions of different momentum

p

, having the same charge, enter normally in a uniform magnetic field. The radius of the orbit of an ion is proportional to

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 3>Q 15

When a charged particle moving with velocity

\vec{v}

is subjected to a magnetic field of induction

\vec{B},

the force on it is non-zero. This implies that

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 3>Q 16

An electron is moving along

+ x

direction. To get it moving in an anticlockwise circular path in

x - y

plane, a magnetic field is applied along

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 3>Q 17

A charged particle is released from rest in a region of uniform electric and magnetic fields, which are parallel to each other. The locus of the particle will be a

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 3>Q 18

Two

α

–particles enter a region of uniform magnetic field with their velocities in the ratio

3 : 2

. Calculate the ratio of the respective radii of their paths.

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 3>Q 19

An electron (mass

= 9.1 \times 10^{- 31} kg

, charge

= - 1.6 \times 10^{- 19} C

) experiences no deflection if subjected to an electric field of

3.2 \times 10^{5} V m^{- 1}

and a magnetic field of

2.0 \times 10^{- 3} Wb m^{- 2}

. Both the fields are normal to the path of electron and to each other. If the electric field is removed, then the electron will revolve in an orbit of radius

Three long straight wires A, B and C are carrying currents as shown in the figure. The resultant force on B is directed,

Important Questions on Magnetic Effects of Current and Magnetism

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Three long straight wires $A, B$ and $C$ are carrying currents as shown in the figure. The resultant force on $B$ is directed,