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

Ques. Assertion (A): The potential energy of an electron revolving in any stationary orbit in a hydrogen atom is positive.
Reason (R) : The total energy of a charged particle is always positive.

(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
(C) Assertion (A) is true, but Reason (R) is false.
(D) Assertion (A) is false and Reason (R) is also false.

Correct Answer : Option (D) Assertion (A) is false and Reason (R) is also false.

Ques. 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
(A) 2592
(C) 2976
(B) 2866
(D) 3140

Correct Answer : Option (B) 2866

Ques. Which one of the following correctly represents the change in wave characteristics (all in vacuum) from microwaves to X-rays in electromagnetic spectrum?

Correct Answer : Option (B)

More Questions : 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 :

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