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PHXII06:ELECTROMAGNETIC INDUCTION

358680 A magnet is dropped down inside a long vertical copper tube

1 The magnet moves with continuously increasing velocity and ultimately acquires a constant terminal velocity

2 The magnet moves with continuously decreasing velocity and ultimately comes to rest

3 The magnet moves with continuously increasing velocity but constant acceleration

4 The magnet moves with continuously increasing velocity and acceleration

PHXII06:ELECTROMAGNETIC INDUCTION

358681 If a copper ring is moved quickly towards south pole of a powerful stationary bar magnet, then

1 Voltage in the magnet increases

2 Current flows through the copper ring

3 Copper ring will get magnetised

4 Current flows in the magnet

PHXII06:ELECTROMAGNETIC INDUCTION

358682 A coil of area $A = 0.5 m^{2}$ is situated in a uniform magnetic field $B = 4.0 W b / m^{2}$ , and area vector makes an angle of $60^{\circ}$ with respect to the magnetic field, as shown in the figure. The value of the magnetic flux through the area $A$ would be equal to
supporting img

1

2 W b

2

1 W b

3

3 W b

4

\frac{3}{2} W b

Explanation:

Angle between normal to the plane of the coil and direction of magnetic field, $θ = 60^{\circ}$
$∴$ Flux linked with coil, $ϕ = B A \cos θ$ $= 4.0 \times 0.5 \times \cos 60^{\circ}$
$\Rightarrow ϕ = 1 W b$

PHXII06:ELECTROMAGNETIC INDUCTION

358683 Consider a circular coil of wire carrying constant current $I$ , forming a magnetic dipole. The magnetic flux through an infinite plane that contains the circular coil and excluding the circular coil area is given by $ϕ_{i}$ . The magnetic flux through the area of the circular coil area is given by $ϕ_{0}$ . Which of the following option is correct?

1

ϕ_{i} < ϕ_{0}

2

ϕ_{i} > ϕ_{0}

3

ϕ_{i} = ϕ_{0}

4

ϕ_{i} = - ϕ_{0}

Explanation:

As, magnetic field lines forms a closed loop, hence each line from circular area will pass through outer area in opposite direction hence $ϕ_{i} = - ϕ_{0}$ .

JEE - 2020

PHXII06:ELECTROMAGNETIC INDUCTION

358680 A magnet is dropped down inside a long vertical copper tube

1 The magnet moves with continuously increasing velocity and ultimately acquires a constant terminal velocity

2 The magnet moves with continuously decreasing velocity and ultimately comes to rest

3 The magnet moves with continuously increasing velocity but constant acceleration

4 The magnet moves with continuously increasing velocity and acceleration

PHXII06:ELECTROMAGNETIC INDUCTION

358681 If a copper ring is moved quickly towards south pole of a powerful stationary bar magnet, then

1 Voltage in the magnet increases

2 Current flows through the copper ring

3 Copper ring will get magnetised

4 Current flows in the magnet

PHXII06:ELECTROMAGNETIC INDUCTION

358682 A coil of area $A = 0.5 m^{2}$ is situated in a uniform magnetic field $B = 4.0 W b / m^{2}$ , and area vector makes an angle of $60^{\circ}$ with respect to the magnetic field, as shown in the figure. The value of the magnetic flux through the area $A$ would be equal to
supporting img

1

2 W b

2

1 W b

3

3 W b

4

\frac{3}{2} W b

Explanation:

Angle between normal to the plane of the coil and direction of magnetic field, $θ = 60^{\circ}$
$∴$ Flux linked with coil, $ϕ = B A \cos θ$ $= 4.0 \times 0.5 \times \cos 60^{\circ}$
$\Rightarrow ϕ = 1 W b$

PHXII06:ELECTROMAGNETIC INDUCTION

358683 Consider a circular coil of wire carrying constant current $I$ , forming a magnetic dipole. The magnetic flux through an infinite plane that contains the circular coil and excluding the circular coil area is given by $ϕ_{i}$ . The magnetic flux through the area of the circular coil area is given by $ϕ_{0}$ . Which of the following option is correct?

1

ϕ_{i} < ϕ_{0}

2

ϕ_{i} > ϕ_{0}

3

ϕ_{i} = ϕ_{0}

4

ϕ_{i} = - ϕ_{0}

Explanation:

As, magnetic field lines forms a closed loop, hence each line from circular area will pass through outer area in opposite direction hence $ϕ_{i} = - ϕ_{0}$ .

JEE - 2020

PHXII06:ELECTROMAGNETIC INDUCTION

358680 A magnet is dropped down inside a long vertical copper tube

1 The magnet moves with continuously increasing velocity and ultimately acquires a constant terminal velocity

2 The magnet moves with continuously decreasing velocity and ultimately comes to rest

3 The magnet moves with continuously increasing velocity but constant acceleration

4 The magnet moves with continuously increasing velocity and acceleration

PHXII06:ELECTROMAGNETIC INDUCTION

358681 If a copper ring is moved quickly towards south pole of a powerful stationary bar magnet, then

1 Voltage in the magnet increases

2 Current flows through the copper ring

3 Copper ring will get magnetised

4 Current flows in the magnet

PHXII06:ELECTROMAGNETIC INDUCTION

358682 A coil of area $A = 0.5 m^{2}$ is situated in a uniform magnetic field $B = 4.0 W b / m^{2}$ , and area vector makes an angle of $60^{\circ}$ with respect to the magnetic field, as shown in the figure. The value of the magnetic flux through the area $A$ would be equal to
supporting img

1

2 W b

2

1 W b

3

3 W b

4

\frac{3}{2} W b

Explanation:

Angle between normal to the plane of the coil and direction of magnetic field, $θ = 60^{\circ}$
$∴$ Flux linked with coil, $ϕ = B A \cos θ$ $= 4.0 \times 0.5 \times \cos 60^{\circ}$
$\Rightarrow ϕ = 1 W b$

PHXII06:ELECTROMAGNETIC INDUCTION

358683 Consider a circular coil of wire carrying constant current $I$ , forming a magnetic dipole. The magnetic flux through an infinite plane that contains the circular coil and excluding the circular coil area is given by $ϕ_{i}$ . The magnetic flux through the area of the circular coil area is given by $ϕ_{0}$ . Which of the following option is correct?

1

ϕ_{i} < ϕ_{0}

2

ϕ_{i} > ϕ_{0}

3

ϕ_{i} = ϕ_{0}

4

ϕ_{i} = - ϕ_{0}

Explanation:

As, magnetic field lines forms a closed loop, hence each line from circular area will pass through outer area in opposite direction hence $ϕ_{i} = - ϕ_{0}$ .

JEE - 2020

PHXII06:ELECTROMAGNETIC INDUCTION

358680 A magnet is dropped down inside a long vertical copper tube

1 The magnet moves with continuously increasing velocity and ultimately acquires a constant terminal velocity

2 The magnet moves with continuously decreasing velocity and ultimately comes to rest

3 The magnet moves with continuously increasing velocity but constant acceleration

4 The magnet moves with continuously increasing velocity and acceleration

PHXII06:ELECTROMAGNETIC INDUCTION

358681 If a copper ring is moved quickly towards south pole of a powerful stationary bar magnet, then

1 Voltage in the magnet increases

2 Current flows through the copper ring

3 Copper ring will get magnetised

4 Current flows in the magnet

PHXII06:ELECTROMAGNETIC INDUCTION

358682 A coil of area $A = 0.5 m^{2}$ is situated in a uniform magnetic field $B = 4.0 W b / m^{2}$ , and area vector makes an angle of $60^{\circ}$ with respect to the magnetic field, as shown in the figure. The value of the magnetic flux through the area $A$ would be equal to
supporting img

1

2 W b

2

1 W b

3

3 W b

4

\frac{3}{2} W b

Explanation:

Angle between normal to the plane of the coil and direction of magnetic field, $θ = 60^{\circ}$
$∴$ Flux linked with coil, $ϕ = B A \cos θ$ $= 4.0 \times 0.5 \times \cos 60^{\circ}$
$\Rightarrow ϕ = 1 W b$

PHXII06:ELECTROMAGNETIC INDUCTION

358683 Consider a circular coil of wire carrying constant current $I$ , forming a magnetic dipole. The magnetic flux through an infinite plane that contains the circular coil and excluding the circular coil area is given by $ϕ_{i}$ . The magnetic flux through the area of the circular coil area is given by $ϕ_{0}$ . Which of the following option is correct?

1

ϕ_{i} < ϕ_{0}

2

ϕ_{i} > ϕ_{0}

3

ϕ_{i} = ϕ_{0}

4

ϕ_{i} = - ϕ_{0}

Explanation:

As, magnetic field lines forms a closed loop, hence each line from circular area will pass through outer area in opposite direction hence $ϕ_{i} = - ϕ_{0}$ .

JEE - 2020