A capacitor of capacitance 30µF is charged by a constant current of 10mA. If initially, the capacitor was uncharged what is the time taken for the potential difference across the capacitor to reach 300V ?

A. 0.9sec
B. 15 sec
C. 1.5x105sec
D. 0.9x102sec

The charged particle enters the uniform magnetic field in such a way that its initial velocity is not perpendicular to the field the orbit will be__________________?

A. A circle
B. A spiral
C. An ellipse
D. Helix

Value of permeability of free space in SI units is___________________?

A. 4πx10-9 wba-1m-1
B. 4πx10-7 wba-1m-1
C. 4πx10-10 wba-1m-1
D. 4πx10-8 wba-1m-1

The magnetic field strength of solenoid is__________________?

A. B = μni
B. B = μn/i
C. B = μni
D. Both b and c

The deflection for 50 division of galvanometer is decreased to 25 divisions by shunt resistance of 12Ω. Galvanometer resistance is_____________?

A. 18ω
B. 30ω
C. 24ω
D. 12ω

The sensitivity of a galvanometer is given by__________________?

A. C/ban
B. Can/b
C. Ban/c
D. Abc/n

Minimum current required to produce a deflection of 1 mm on a scale at a distance of 1 meter is__________________?

A. 0.1 a
B. 1:00 am
C. Current sensitivity
D. 1 m a

While measuring the unknown resistance the help of slide wire bridge a greatest accuracy can be achieved when__________________?

A. A most sensitive galvanometer is used
B. A steady voltage cell is used
C. The balance point is close to the middle of the wire
D. A high resistance box is used in one of its gap

An ammeter measures the total current flowing through a circuit when it is connected__________________?

A. In series with the circuit
B. In parallel with circuit
C. In series with any of the parallel resistances in the circuit
D. In parallel with any of the series resistances in the circuit

The effective way to increase the sensitivity of a moving coil galvanometer is to___________________?

A. Use a very long and fine suspension
B. Use a coil of very large area
C. Use a coil with very large number of turns
D. Use a very strong magnetic field