15) The current I flowing in resistor R in the circuit shown below is: (A) 12 -

Question

15) The current I flowing in resistor R in the circuit shown below is: (A) 12 - (B) I1 (C) Is + 12 (D) 11 - 12 (E) 12 14 R. E2 la 16) Which of the following diagrams represents the magnetic field direction due to a current in a circular loop? 17) In the Magnetic Force experiment, the relationship between the force in (mN) that acts on a 4 cm wide conductor loop and the current of the loop was drown as shown below. If the current is perpendicular to the magnetic field then the magnetic field in this experiment is: F vs l -1.2534x+0.2127 14 12 10 (A) 3.13 x 104 T (B) 0.0313 mT (C) 31.3 mT (D) 0.313 T (E) 31.3 T 10 I (A)

Explanation / Answer

Q15:

applying KCL at point B, I1= I2+I

Thus, I =I1 - I2. Hence, option (d) is correct.

Q16

From Right-hand cross rule, it can be seen that option (a) is correct. Because for an anticlockwise current in the loop, magnetic field should come out of the plane (perpendicular) of the paper (i.e dot).

Q17:

F= BILsin(theta)

here, theta=90 degree

F=BIL

now, (F/I)=BL =slope of the curve= 1.2534 mN/A.

L=4cm=0.04m

B= (BL)/L =(1.2534/0.04) mT =31.335 mT.

Hence option (c) is correct.

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