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Obtain expressions for instantaneous values of alternating emf and current.
Can the bulb of a thermometer be made of an adiabatic wall?
What is the speed of a photon with respect to another photon if:
- The two photons are going in the same direction and.
- They are going in opposite directions?
Consider a box with three terminals on top of it as shown in Fig (a): 
Three components namely, two germanium diodes and one resistor are connected across these three terminals in some arrangement. A student performs an experiment in which any two of these three terminals are connected in the circuit shown in Fig. (b). 
The student obtains graphs of current-voltage characteristics for unknown combination of components between the two terminals connected in the circuit. The graphs are
Three components namely, two germanium diodes and one resistor are connected across these three terminals in some arrangement. A student performs an experiment in which any two of these three terminals are connected in the circuit shown in Fig. (b). The student obtains graphs of current-voltage characteristics for unknown combination of components between the two terminals connected in the circuit. The graphs are - When A is positive and B is negative,
- When A is negative and B is positive,
- When B is negative and C is positive,
- When B is positive and C is negative,
- When A is positive and C is negative,
- When A is negative and C is positive,
An operator sitting in his base camp sends a sound signal of frequency 400Hz. The signal is reflected back from a car moving towards him. The frequency of the reflected sound is found to be 410Hz. Find the speed of the car. Speed of sound in air = 324m/s.
A scooter company gives the following specifications about its product.
- Weight of the scooter - 95kg.
- Maximum speed - 60km/h.
- Maximum engine power - 3.5hp.
- Pick up time to get the maximum speed - 5s.
- Check the validity of these specifications.
Shows a convex lens of focal length 12cm lying in a uniform magnetic field B of magnitude 1.2T parallel to its principal axis. A particle with charge 2.0 × 10-3C and mass 2.0 × 10-5 kg is projected perpendicular to the plane of the diagram with a speed of 4.8 ms-1. The particle moves along a circle with its centre on the principal axis at a distance of 18cm from the lens. Show that the image of the particle moves along a circle and find the radius of that circle.
Calculate the electric field in a copper wire of cross-sectional area 2.0mm2 carrying a current of 1A.
The resistivity of copper $=1.7\times10^{-8}\Omega\text{-m}.$
→The resistivity of copper $=1.7\times10^{-8}\Omega\text{-m}.$
A source contains two phosphorous radio nuclides $^{32}_{15}\text{P }(\text{T}_{1/2}=14.3\text{d})$ and $^{33}_{15}\text{P }(\text{T}_{1/2}=25.3\text{d})$ Initially, 10% of the decays come from $^{33}_{15}\text{P}.$ How long one must wait until 90% do so?
→Four charges are arranged at the corners of a square $ABCD$ of side $d$, as shown in Fig. 2.15.(a) Find the work required to put together this arrangement. (b) A charge $q_0$ is brought to the centre $E$ of the square, the four charges being held fixed at its corners. How much extra work is needed to do this?
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