Chapter 17 Electromagnetic Induction

What is the magnetic flux linked with the plane?

• BA cos $\theta$

• BA sin $\theta$

• 2BA cos $\theta$

• 2BA sin $\theta$

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A coil of area 30 $cm^2$ and 50 turns is placed perpendicular to the magnetic field of flux density 0.7 T. What is the magnetic flux linked with the coil? 

• 0.021 Wb

• 0.105 Wb

• 1050 Wb

• 1500 Wb

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NGSS.HS-PS2-5

A plane of area 25  $cm^2$ is placed in a magnetic field of flux density 1.2 T. If the plane is inclined at  $30^{\degree}$   to the magnetic field, calculate the magnetic flux linked with the plane.

• 0.0015 Wb

• 0.0030 Wb

• 0.0026 Wb

• 0.0035 Wb

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If XY is the normal line to the plane of the coil, what is the ratio of  $\frac{magnetic\ flux\ in\ \left(a\right)}{magnetic\ flux\ in\ \left(b\right)}$  ?

• 1:2

• 1:1

• 2:1

• 3:2

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A circular coil of area 1.5 $m^2$ and number of turns 200 is placed in a 1.4 T magnetic field which is perpendicular to the plane of the coil as shown in the diagram. If this magnetic field is reduced to 0.20 T in 0.01 s, what is the e.m.f. induced in the coil?

• 1.8 $\times10^2$ V

• 2.4 $\times10^2$ V

• 3.0 $\times10^4$  V

• 3.6 $\times10^4$  V

A bar magnet is moved towards a solenoid. Which of the following statement is not true about the changes experienced by the solenoid?

• The galvanometer deflects when the magnet is brought near to the solenoid.

• The induced current flows from X to Y when the magnet is approaching the solenoid.

• The galvanometer shows maximum deflection when the magnet is in the centre of the solenoid.

• The solenoid at end P acts as North pole when the magnet is moved away from end P.

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If points C and M are connected by a conducting wire, which statement is not true about the metal rod?

• The induced current flows from M to C.

• The e.m.f. induced in the rod is B $l$ v.

• The end C of the rod is positively charged.

• The free electrons in the rod experiences upward magnetic force.

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If the current flows in the wire increases at a constant rate, which statement below is true about the induced current in the coil?

• It is constant and is in the clock wise direction.

• It is constant and is in the anticlockwise direction.

• It increase with time and is in the clockwise direction.

• It is zero.

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An e.m.f. is induced in the coil from right to left. Which of the following  describes the current through the coil?

• The current is constant and it moves from right to left.

• The current is constant and it moves from left to right.

• The current is increasing and it moves from left to righ.

• The current is increasing and it moves from right to left.

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A solenoid of length $l$ and cross-sectional area A contains N turns of wire. Which of the following shows the self-inductance L of the solenoid?

•  $\frac{\mu_0N^2A}{l}$  

•  $\frac{\mu_0N^2\pi r}{2}$  

•  $\mu_0N^2\pi r$  

•  $\mu_0N^2A$  

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