The uniform magnetic field in the diagram changes with time as B 0.401 Tesla. Th

Question

The uniform magnetic field in the diagram changes with time as B 0.401 Tesla. The radius of the circular loop is r= 1 1.3 cm and its resistance is 1.0 S2. The magnitude and direction of the current in the loop, observed from above, is (a). 1.8 A, counterclockwise (b). 250 mA, clockwise (c). 11 mA, clockwise (d). 0.17 A, counterclockwise (e). 0.17 A, clockwise 45 0 The figure shows how the three different types of magnetic material magnetize in response to an external magnetic field The correct identification of materials 1, 2, and 3 is (a). 1-paramagnetic, 2-diamagnetic, 3-ferromagnetic (b). 1-diamagnetic, 2-ferromagnetic, 3-paramagnetic (c). 1-paramagnetic, 2 -ferromagnetic, 3-diamagnetic (d). 1-ferromagnetic, 2 paramagnetic, 3-diamagnetic (e). 1-ferromagnetic, 2-diamagnetic, 3-paramagnetic 12 Magnetization of the material Applied magnetic field 13 An LC circuit oscillates at f-20 kHz. The inductance of the circuit is L = 32 H. The capacitance is (a). 2.0 pF (b). 3.2 pF (c). 4.6 nF (d). 0.46 pF (e). 2.0 nF ? 3? ,? 8?

Explanation / Answer

11. e = - d(flux)/dt = -A cos45 dB/dt

e = - (pi 0.113^2) (cos45) (0.4)

e = - 0.011 ohm

I = e / R = - 0.011 A oR 11 mA  

Ans: (C) 11 ma clockwise

12. 1 = ferromagnetic

2 = paramagnetic

3 = Diamagnetic

Ans: (d)

13. f = 1/(2 pi sqrt(LC))

L C = 1 / (2 pi f)^2

(32)(C) = 1/(2 x pi x 20 x 10^3)^2

C = 2 x 10^-12 F Or 2 pF  

Ans(a)

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