Jee 2014 Booklet7 Hwt Electromagnetic Induction

Vidyamandir Classes DATE :

TIME : 40 Minutes

MARKS : [ ___ /15]

TEST CODE : EMI [1]

START TIME :

END TIME :

TIME TAKEN:

PARENT’S SIGNATURE :

 This test contains a total of 15 Objective Type Questions. Each question carries 1 mark. There is NO NEGATIVE marking. Choose the correct alternative. Only one choice is correct. 1.

There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then (seen from upper side) (A) current is induced in the loop in the anticlockwise direction (B) current is induced in the loop in the clockwise direction (C) AC is induced in the loop (D) no current is induced in the loop

2.

A square loop of wire, side length 10 cm is placed at angel of 45 with a magnetic field that changes uniformly from 0.1 T to zero in 0.7 s. The induced current in the loop (its resistance is Ω ) is : (A) 1.0 mA (B) 2.5 mA (C)

3.

5.

6.

(D)

4.0 mA

Flux  (in weber) in a closed circuit of resistance 20Ω varies with time t (in second) according to equation   6t 2  5t 1 . The magnitude of the induced current at t = 0.25 s is : (A) 1.2 A (B) 0.8 A

4.

3.5 mA

(C)

0.6 A

(D)

0.1 A

O is the centre of two coplanar concentric circular conductors, A and B, of radii r and R respectively as shown in the figure. Here r