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A force given by the relation F= 8t acts on a body of mass 2 kg, initially at rest. Find the work done by this force on the body during the first 2 seconds of its motion.

a) 0 b) 1 c) -64 J d) 64 J Solution: d) 64 J Explanation: F=8t Work is said to be done when an object experiences displacement.... View Article

Two coils have self-inductance L1=4mH and L2=1mH respectively. The currents in the two coils are increased at the same rate. At a certain instant of time both coils are given the same power. If i1 and i2 are the currents in the two coils, at that instant of time respectively, then the value of (i1 /i2) is :

a) 0 b) 1 c) ½ d) ¼ Solution: d) ¼ Explanation:... View Article

If we change the value of R, then

a) Voltage does not change on C b) Voltage does not change on L c) Voltage change on LC combination d) Voltage does not change on LC... View Article

In a wave E0 =100Vm−1. Find the poynting vector magnitude.

Solution:... View Article

A square coil ACDE with it’s plane vertical is released from rest in a horizontal uniform magnetic field B of length 2L ( as shown in figure). The acceleration of the coil is

< p>a) g all the time b) less than g for all time till the loop crosses the magnetic field completely c) less than g when it enters the field... View Article

When a loop moves towards a stationary magnet with speed v, the induced emf in the loop is E. If the magnet also moves away from the loop with the same speed, then the emf induced in the loop is

a) E b) 2E c) E/2 d) Zero Solution: d) zero Explanation: If loop and a stationary magnet move with the same velocity in the same direction,... View Article

A small signal voltage V(t)= V0sinωt V(t)=V0sinωt is applied across an ideal capacitor C:

a) Current I (t) is in phase with voltage V(t) b) Over a full cycle the capacitor C does not consume any energy from the voltage source c)... View Article

Two weights w1 and w2 are suspended on the ends of a string on a frictionless pulley. When pulled up with an acceleration g, the tension in the string is?

Solution: for second weight... View Article

Which wavelength of sun is used finally as electric energy?

a) Visible light b) Radio waves c) Microwaves d) Infrared waves Solution: d) Infrared waves Explanation: Infrared waves also known as heat... View Article

An electric bulb is designed to operate at 12 volts DC. If this bulb is connected to an AC source and gives normal brightness , what would be the peak voltage of the source?

Solution: Potential =12v Hence, the RMS value of the AC voltage must be equal to 12v. The peak value of the voltage is: = 16.85 V Hence, the... View Article

An inductor may store energy in?

a) its magnetic field b) its electric field c) its coil d) both electric and magnetic fields Solution: a) its magnetic field. Explanation:... View Article

A 150 m long metal wire connects points A and B. The electric potential at point B is 50V less than that at point A. If the conductivity of the metal is 60 × 10^6 mho/m then magnitude of the current density in the wire is equal to?

Solution:... View Article

Taking into account the significant figures, what is the value of 9.99m−0.0099m?

a) 9.98m b) 9.980m c) 9.980m d) 9.9801m <strong>Solution:</strong> a) 9.98m Explanation: 9.99m−0.0099m=9.9801m = 9.98m... View Article

A loop is formed by two parallel conductors conducted by a solenoid with inductance L and a conducting rod of mass m, which can freely (without friction) slide over the conductors. The conductors are located in a horizontal plane in a uniform vertical magnetic field with induction B. The distance between the conductors is equal to l At the moment t=0 a constant force F starts acting on the rod. Angular frequency of motion rod is. What happens if F and m are doubled?

a) b) c) d) Solution: d)... View Article

M	T	W	T	F	S	S
		1	2	3	4	5
6	7	8	9	10	11	12
13	14	15	16	17	18	19
20	21	22	23	24	25	26
27	28	29	30	31

Archives

A force given by the relation F= 8t acts on a body of mass 2 kg, initially at rest. Find the work done by this force on the body during the first 2 seconds of its motion.

If we change the value of R, then

In a wave E0 =100Vm−1. Find the poynting vector magnitude.

A square coil ACDE with it’s plane vertical is released from rest in a horizontal uniform magnetic field B of length 2L ( as shown in figure). The acceleration of the coil is

When a loop moves towards a stationary magnet with speed v, the induced emf in the loop is E. If the magnet also moves away from the loop with the same speed, then the emf induced in the loop is

A small signal voltage V(t)= V0sinωt V(t)=V0sinωt is applied across an ideal capacitor C:

Two weights w1 and w2 are suspended on the ends of a string on a frictionless pulley. When pulled up with an acceleration g, the tension in the string is?

Which wavelength of sun is used finally as electric energy?

An electric bulb is designed to operate at 12 volts DC. If this bulb is connected to an AC source and gives normal brightness , what would be the peak voltage of the source?

An inductor may store energy in?

A 150 m long metal wire connects points A and B. The electric potential at point B is 50V less than that at point A. If the conductivity of the metal is 60 × 10^6 mho/m then magnitude of the current density in the wire is equal to?

Taking into account the significant figures, what is the value of 9.99m−0.0099m?

Which of the following pairs of coils has zero coupling constant?

Factors of 2700

How to find number of divisors of a number.

Convert 35 to binary.

60% of 264 is the same as

How to check whether a year is leap year?

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