The figure shows a uniform magnetic field B rightarrow directed to the left and

Question

The figure shows a uniform magnetic field B rightarrow directed to the left and a wire carrying a current into the page. The magnetic force acting on the wire is: A) toward the top of the page B) toward the bottom of the page C) toward the left D) toward the right E) zero As a loop of wire with a resistance of 10 ohm moves in a constant non-uniform magnetic field, it loses kinetic energy at a uniform rate of 5.0 mJ/s. The induced current in the loop is: A) 0 A B) 2.0 mA C) 2.8 mA D) 22 mA A 35-mu F capacitor is connected to an ac source of emf with a frequency of 250 Hz and a maximum emf of 20 V. If the voltage across the capacitor is zero at time t = 0, what is the voltage at time t = 3.0 ms? Assume the phase constant is zero. A)-20 V B)-10 V C) 0 V D) 10 V E) 20 V An electron in a hydrogen atom moves in a circle of radius 1.1 times 10^-10 m at a speed of about 1.6 times 10^6 m/s. What is the magnetic dipole moment of this electron due to its orbital motion? A) 9.3 times 10^-24 B) 1.4 times 10^-23 C) 1.9 times 10^-23 D) 2.8 times 10^-23 J/T

Explanation / Answer

45)(A)towards the top of the page.

Using right hand rule, curling I into B the thumb points upwards, so the magnetic force is towards the top of the page.

58) (D)22 mA

explanation

P = V^2/R = I^2 R

P = E/t = 5 mJ/s = 0.005 J/s

P = I^2 R = 0.005

I = sqrt (0.005/10) = 0.022 A = 22 mA

Hence, (D) 22 mA

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