00. Magnetic Flux, Faraday's Law
Electro Magnetic Induction

154560 The flux linked with a circuit is given by $\phi=t^{3}$ $+3 t-7$. The graph between time ( $x$-axis) and induced emf (y-axis) will be a

1 straight line through the origin
2 straight line with positive intercept
3 straight line with negative intercept
4 parabola through the origin
5 parabola not through the origin
Electro Magnetic Induction

154561 A square coil of side $25 \mathrm{~cm}$ having 1000 turns is rotated with a uniform speed in a magnetic field about an axis perpendicular to the direction of the field. At an instant $t$, the emf induced in the coil is $e=200 \sin 100 \pi \mathrm{t}$. The magnetic induction is

1 $0.50 \mathrm{~T}$
2 $0.02 \mathrm{~T}$
3 $10^{-3} \mathrm{~T}$
4 $0.1 \mathrm{~T}$
5 $0.01 \mathrm{~T}$
Electro Magnetic Induction

154562 A varying magnetic flux linking a coil is given by $\phi=\mathbf{X t}^{2}$.If at time $t=3 \mathrm{~s}$, the emf induced is $9 \mathrm{~V}$, then the value of $\mathrm{X}$ is:

1 $0.66 \mathrm{~Wb} \mathrm{~s}^{-2}$
2 $1.5 \mathrm{~Wb} \mathrm{~s}^{-2}$
3 $-0.66 \mathrm{~Wb} \mathrm{~s}^{-2}$
4 $-1.5 \mathrm{~Wb} \mathrm{~s}^{-2}$
5 $-0.33 \mathrm{~Wb} \mathrm{~s}^{-2}$
Electro Magnetic Induction

154563 A copper disc of radius $0.1 \mathrm{~m}$ is rotated about its centre with $20 \mathrm{rev} / \mathrm{s}$ in a uniform magnetic field of $0.1 \mathrm{~T}$ with its plane perpendicular to the field. The emf induced across the radius of the disc is :

1 $\frac{\pi}{20} \mathrm{~V}$
2 $\frac{\pi}{10} \mathrm{~V}$
3 $20 \pi \mathrm{mV}$
4 $10 \pi \mathrm{mV}$
5 $2 \pi \mathrm{mV}$
Electro Magnetic Induction

154564 A coil having an inductance of $0.5 \mathrm{H}$ carries a current which is uniformly varying from 0 to $10 \mathrm{~A}$ in $2 \mathrm{~s}$. The emf (in volts) generated in the coil is:

1 10
2 5
3 2.5
4 1.25
5 0.25
Electro Magnetic Induction

154560 The flux linked with a circuit is given by $\phi=t^{3}$ $+3 t-7$. The graph between time ( $x$-axis) and induced emf (y-axis) will be a

1 straight line through the origin
2 straight line with positive intercept
3 straight line with negative intercept
4 parabola through the origin
5 parabola not through the origin
Electro Magnetic Induction

154561 A square coil of side $25 \mathrm{~cm}$ having 1000 turns is rotated with a uniform speed in a magnetic field about an axis perpendicular to the direction of the field. At an instant $t$, the emf induced in the coil is $e=200 \sin 100 \pi \mathrm{t}$. The magnetic induction is

1 $0.50 \mathrm{~T}$
2 $0.02 \mathrm{~T}$
3 $10^{-3} \mathrm{~T}$
4 $0.1 \mathrm{~T}$
5 $0.01 \mathrm{~T}$
Electro Magnetic Induction

154562 A varying magnetic flux linking a coil is given by $\phi=\mathbf{X t}^{2}$.If at time $t=3 \mathrm{~s}$, the emf induced is $9 \mathrm{~V}$, then the value of $\mathrm{X}$ is:

1 $0.66 \mathrm{~Wb} \mathrm{~s}^{-2}$
2 $1.5 \mathrm{~Wb} \mathrm{~s}^{-2}$
3 $-0.66 \mathrm{~Wb} \mathrm{~s}^{-2}$
4 $-1.5 \mathrm{~Wb} \mathrm{~s}^{-2}$
5 $-0.33 \mathrm{~Wb} \mathrm{~s}^{-2}$
Electro Magnetic Induction

154563 A copper disc of radius $0.1 \mathrm{~m}$ is rotated about its centre with $20 \mathrm{rev} / \mathrm{s}$ in a uniform magnetic field of $0.1 \mathrm{~T}$ with its plane perpendicular to the field. The emf induced across the radius of the disc is :

1 $\frac{\pi}{20} \mathrm{~V}$
2 $\frac{\pi}{10} \mathrm{~V}$
3 $20 \pi \mathrm{mV}$
4 $10 \pi \mathrm{mV}$
5 $2 \pi \mathrm{mV}$
Electro Magnetic Induction

154564 A coil having an inductance of $0.5 \mathrm{H}$ carries a current which is uniformly varying from 0 to $10 \mathrm{~A}$ in $2 \mathrm{~s}$. The emf (in volts) generated in the coil is:

1 10
2 5
3 2.5
4 1.25
5 0.25
Electro Magnetic Induction

154560 The flux linked with a circuit is given by $\phi=t^{3}$ $+3 t-7$. The graph between time ( $x$-axis) and induced emf (y-axis) will be a

1 straight line through the origin
2 straight line with positive intercept
3 straight line with negative intercept
4 parabola through the origin
5 parabola not through the origin
Electro Magnetic Induction

154561 A square coil of side $25 \mathrm{~cm}$ having 1000 turns is rotated with a uniform speed in a magnetic field about an axis perpendicular to the direction of the field. At an instant $t$, the emf induced in the coil is $e=200 \sin 100 \pi \mathrm{t}$. The magnetic induction is

1 $0.50 \mathrm{~T}$
2 $0.02 \mathrm{~T}$
3 $10^{-3} \mathrm{~T}$
4 $0.1 \mathrm{~T}$
5 $0.01 \mathrm{~T}$
Electro Magnetic Induction

154562 A varying magnetic flux linking a coil is given by $\phi=\mathbf{X t}^{2}$.If at time $t=3 \mathrm{~s}$, the emf induced is $9 \mathrm{~V}$, then the value of $\mathrm{X}$ is:

1 $0.66 \mathrm{~Wb} \mathrm{~s}^{-2}$
2 $1.5 \mathrm{~Wb} \mathrm{~s}^{-2}$
3 $-0.66 \mathrm{~Wb} \mathrm{~s}^{-2}$
4 $-1.5 \mathrm{~Wb} \mathrm{~s}^{-2}$
5 $-0.33 \mathrm{~Wb} \mathrm{~s}^{-2}$
Electro Magnetic Induction

154563 A copper disc of radius $0.1 \mathrm{~m}$ is rotated about its centre with $20 \mathrm{rev} / \mathrm{s}$ in a uniform magnetic field of $0.1 \mathrm{~T}$ with its plane perpendicular to the field. The emf induced across the radius of the disc is :

1 $\frac{\pi}{20} \mathrm{~V}$
2 $\frac{\pi}{10} \mathrm{~V}$
3 $20 \pi \mathrm{mV}$
4 $10 \pi \mathrm{mV}$
5 $2 \pi \mathrm{mV}$
Electro Magnetic Induction

154564 A coil having an inductance of $0.5 \mathrm{H}$ carries a current which is uniformly varying from 0 to $10 \mathrm{~A}$ in $2 \mathrm{~s}$. The emf (in volts) generated in the coil is:

1 10
2 5
3 2.5
4 1.25
5 0.25
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Electro Magnetic Induction

154560 The flux linked with a circuit is given by $\phi=t^{3}$ $+3 t-7$. The graph between time ( $x$-axis) and induced emf (y-axis) will be a

1 straight line through the origin
2 straight line with positive intercept
3 straight line with negative intercept
4 parabola through the origin
5 parabola not through the origin
Electro Magnetic Induction

154561 A square coil of side $25 \mathrm{~cm}$ having 1000 turns is rotated with a uniform speed in a magnetic field about an axis perpendicular to the direction of the field. At an instant $t$, the emf induced in the coil is $e=200 \sin 100 \pi \mathrm{t}$. The magnetic induction is

1 $0.50 \mathrm{~T}$
2 $0.02 \mathrm{~T}$
3 $10^{-3} \mathrm{~T}$
4 $0.1 \mathrm{~T}$
5 $0.01 \mathrm{~T}$
Electro Magnetic Induction

154562 A varying magnetic flux linking a coil is given by $\phi=\mathbf{X t}^{2}$.If at time $t=3 \mathrm{~s}$, the emf induced is $9 \mathrm{~V}$, then the value of $\mathrm{X}$ is:

1 $0.66 \mathrm{~Wb} \mathrm{~s}^{-2}$
2 $1.5 \mathrm{~Wb} \mathrm{~s}^{-2}$
3 $-0.66 \mathrm{~Wb} \mathrm{~s}^{-2}$
4 $-1.5 \mathrm{~Wb} \mathrm{~s}^{-2}$
5 $-0.33 \mathrm{~Wb} \mathrm{~s}^{-2}$
Electro Magnetic Induction

154563 A copper disc of radius $0.1 \mathrm{~m}$ is rotated about its centre with $20 \mathrm{rev} / \mathrm{s}$ in a uniform magnetic field of $0.1 \mathrm{~T}$ with its plane perpendicular to the field. The emf induced across the radius of the disc is :

1 $\frac{\pi}{20} \mathrm{~V}$
2 $\frac{\pi}{10} \mathrm{~V}$
3 $20 \pi \mathrm{mV}$
4 $10 \pi \mathrm{mV}$
5 $2 \pi \mathrm{mV}$
Electro Magnetic Induction

154564 A coil having an inductance of $0.5 \mathrm{H}$ carries a current which is uniformly varying from 0 to $10 \mathrm{~A}$ in $2 \mathrm{~s}$. The emf (in volts) generated in the coil is:

1 10
2 5
3 2.5
4 1.25
5 0.25
Electro Magnetic Induction

154560 The flux linked with a circuit is given by $\phi=t^{3}$ $+3 t-7$. The graph between time ( $x$-axis) and induced emf (y-axis) will be a

1 straight line through the origin
2 straight line with positive intercept
3 straight line with negative intercept
4 parabola through the origin
5 parabola not through the origin
Electro Magnetic Induction

154561 A square coil of side $25 \mathrm{~cm}$ having 1000 turns is rotated with a uniform speed in a magnetic field about an axis perpendicular to the direction of the field. At an instant $t$, the emf induced in the coil is $e=200 \sin 100 \pi \mathrm{t}$. The magnetic induction is

1 $0.50 \mathrm{~T}$
2 $0.02 \mathrm{~T}$
3 $10^{-3} \mathrm{~T}$
4 $0.1 \mathrm{~T}$
5 $0.01 \mathrm{~T}$
Electro Magnetic Induction

154562 A varying magnetic flux linking a coil is given by $\phi=\mathbf{X t}^{2}$.If at time $t=3 \mathrm{~s}$, the emf induced is $9 \mathrm{~V}$, then the value of $\mathrm{X}$ is:

1 $0.66 \mathrm{~Wb} \mathrm{~s}^{-2}$
2 $1.5 \mathrm{~Wb} \mathrm{~s}^{-2}$
3 $-0.66 \mathrm{~Wb} \mathrm{~s}^{-2}$
4 $-1.5 \mathrm{~Wb} \mathrm{~s}^{-2}$
5 $-0.33 \mathrm{~Wb} \mathrm{~s}^{-2}$
Electro Magnetic Induction

154563 A copper disc of radius $0.1 \mathrm{~m}$ is rotated about its centre with $20 \mathrm{rev} / \mathrm{s}$ in a uniform magnetic field of $0.1 \mathrm{~T}$ with its plane perpendicular to the field. The emf induced across the radius of the disc is :

1 $\frac{\pi}{20} \mathrm{~V}$
2 $\frac{\pi}{10} \mathrm{~V}$
3 $20 \pi \mathrm{mV}$
4 $10 \pi \mathrm{mV}$
5 $2 \pi \mathrm{mV}$
Electro Magnetic Induction

154564 A coil having an inductance of $0.5 \mathrm{H}$ carries a current which is uniformly varying from 0 to $10 \mathrm{~A}$ in $2 \mathrm{~s}$. The emf (in volts) generated in the coil is:

1 10
2 5
3 2.5
4 1.25
5 0.25