Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Resistance of capacitor for high frequency is:

A rod AB moves with a uniform velocity v in a uniform magnetic field as shown in figure.

1. The rod becomes electrically charged.
2. The end A becomes positively charged.
3. The end B becomes positively charged.
4. The rod becomes hot because of Joule heating.

In the propagation of electromagnetic waves the angle between the direction of propagation and the plane of vibration is ________

Which type of a physical quantity is electric current?

Figure represents two simple harmonic motions. The parameter which has different values in the two motions is:

1. Amplitude.
2. Frequency.
3. Phase.
4. Maximum velocity.

Photoelectric effect was discovered by:

A parallel plate capacitor is charged from a battery and the battery is removed. Now if the distance between the plates of the capacitor is increased, then in the capacitor:

A two metre wire is moving with a velocity of 1 m/sec perpendicular to a magnetic field of 0.5 weber/m². The e.m.f. induced in it will be

(a) 0.5 volt

(b) 0.1 volt

(c) 1 volt

(d) 2 volt

de-Broglie wavelength of a body of mass m and kinetic energy E is given by

(a)

(b)

(c)

(d)

A charge Q is divided into two parts of q  and Q - q. If the coulomb repulsion between them when they are separated is to be maximum, the ratio of   should be

(a) 2

(b) 1/2

(c) 4

(d) 1/4