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Showing 2226 to 2250 of 3046 questions (page 90 of 122).

2226. The magnetic field inside a long solenoid with n turns per unit length carrying current I is

A. mu_0 n / I B. n I / mu_0 C. mu_0 I / n D. mu_0 I E. mu_0 n I

2227. The SI unit of magnetic flux is

A. weber B. henry C. gauss D. ampere turn E. tesla

2228. A charged particle moving parallel to a uniform magnetic field experiences a force of

A. qvB B. maximum magnitude C. half the maximum D. zero E. qE

2229. Ampere's circuital law relates the line integral of the magnetic field around a closed loop to

A. the enclosed charge B. the enclosed current C. the loop area D. the flux through the loop E. the emf induced

2230. Lenz's law is a consequence of the conservation of

A. flux B. momentum C. energy D. mass E. charge

2231. The motional emf induced in a rod of length l moving with velocity v perpendicular to a magnetic field B is

A. B/vl B. B2vl C. Bl/v D. Bvl E. Bv/l

2232. The SI unit of self inductance is

A. tesla B. henry C. farad D. ohm E. weber

2233. The energy stored in an inductor of inductance L carrying current I is

A. L/I2 B. LI2 C. LI D. (1/2)LI E. (1/2)LI2

2234. In a step up transformer

A. the secondary has more turns than the primary B. the secondary has fewer turns than the primary C. power in the secondary exceeds that in the primary D. the secondary voltage is lower E. the secondary current is greater

2235. Eddy currents in transformer cores are reduced by

A. using a copper core B. increasing the frequency C. using a solid iron core D. removing the core E. laminating the core

2236. The root mean square value of an alternating current of peak value I_0 is

A. I_0/2 B. I_0 C. I_0/sqrt(2) D. 2 I_0 / pi E. sqrt(2) I_0

2237. The resonant frequency of a series LC circuit is

A. 1/(2 pi sqrt(LC)) B. 2 pi sqrt(LC) C. 2 pi LC D. 1/(2 pi LC) E. sqrt(LC)

2238. The capacitive reactance of a capacitor

A. is independent of frequency B. decreases with frequency C. is zero at all frequencies D. increases with frequency E. equals the resistance

2239. In a purely inductive AC circuit, the current

A. is in phase with the voltage B. leads by 45 degrees C. is zero D. lags the voltage by 90 degrees E. leads the voltage by 90 degrees

2240. The speed of electromagnetic waves in free space is

A. 1.5 x 10^8 m s-1 B. 3 x 10^6 m s-1 C. 332 m s-1 D. 3 x 10^8 m s-1 E. 3 x 10^10 m s-1

2241. The power factor of a purely resistive AC circuit is

A. 0.5 B. 1 C. 0.707 D. infinite

2242. The SI unit of Young's modulus is

A. N m2 B. N m-1 C. N m-2 D. dimensionless E. N m

2243. A solid in which the atoms have no long range order is called

A. amorphous B. crystalline C. isomorphic D. polymeric E. ferromagnetic

2244. In an insulator, the energy gap between the valence and conduction bands is

A. about 1.1 eV B. about 0.7 eV C. zero D. negative E. greater than about 5 eV

2245. Above the Curie temperature, a ferromagnetic material becomes

A. diamagnetic B. more strongly ferromagnetic C. non-magnetic in the sense of losing all response D. superconducting E. paramagnetic

2246. Stress within the elastic limit is

A. proportional to the square of strain B. zero C. directly proportional to strain D. inversely proportional to strain E. independent of strain

2247. A p-n junction diode conducts appreciably when

A. the depletion region widens B. forward biased C. at absolute zero D. reverse biased E. unbiased

2248. The output ripple frequency of a full wave rectifier fed from a 50 Hz supply is

A. 100 Hz B. 150 Hz C. zero D. 25 Hz E. 50 Hz

2249. A Zener diode in a voltage regulator circuit is operated in

A. zero bias B. the saturation region C. forward bias D. reverse bias beyond the breakdown voltage E. the cut off region

2250. Which logic gate is called a universal gate?

A. NOT B. NAND C. AND D. XOR E. OR

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