Electromagnetic Induction MCQ Level - 1 - Physics MCQ

A copper ring is tied to a string and suspended vertically. On bringing a magnetic towards the coil, as shown in the figure

A metallic rod completes its circuit as shown in the figure. The circuit is normal to a magnetic field  B = 0.15 tesla. If the resistances of the rod is 3Ω the force required to move the rod with a constant velocity of 2m/sec is :

The plate circular coils P and Q have radii r₁ and  r₂. (r₁ << r₂) and are coaxial as shown in figure. the number of turns in P and Q are respectively N₁ and  N₂. If current in coil Q is varied steadily at a rate x A/s then the induced emf in the coil P will be approximately :

A metal rod of length L is placed normal to a magnetic field and rotated through one end of rod in a circular path with frequency f. The potential difference between it ends will be :

A circular conducting loop is placed in uniform magnetic field B = 0.025 Tesla  perpendicular to plane of loop. The loop is allowed to shrink in radius at rate 1 mm/second. When radius is 2 cm. What is the value of instantaneous induced EMF.

The graph between the current and the time for an inductance coil is shown below which of the following graph show the voltage time variation

In a step down transformer input voltage is 200 volt and output voltage 5 volt. The ratio of number of turns in it will be