Ques. A voltage v = v0 sin wt applied to a circuit drives a current i = i0sin (wt + phi) in the circuit. The average power consumed in the circuit over a cycle is :

Correct Answer : Option (D)

Ques.The speed of light in two media ‘1’ and ‘2’ are v1 and v2(>v 1 ) respectively. For a ray of light to undergo total internal reflection at the interface of these two media, it must be incident from :

(A) medium ‘1’ and at an angle greater than sin-1 (v1/v2)
(B) medium ‘1’ and at an angle greater than cos-1 (v1}/v2)
(C) medium ‘2’ and at an angle greater than sin-1 (v1}/v2})
(D) medium ‘2’ and at an angle greater than cos-1 (v1/v2)

Correct Answer : Option (A) medium ‘1’ and at an angle greater than sin-1 (v1/v2)

Ques. A coil has 100 turns, each of area 0.05 m² and total resistance 1.5 Q. It is inserted at an instant in a magnetic field of 90 mT, with its axis parallel to the field. The charge induced in the coil at that instant is :
(A) 3.0 mC
(B) 0.30 C
(C) 0.45 C
(D) 1.5 C

Correct Answer : Option (B) 0.30 C

More Questions : You are required to design an air-filled solenoid of inductance 0.016 Η having a length 0.81 m and radius 0.02 m. The number of turns in the solenoid should be :

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