ELECTROMGNETISM

1.A coil of inductance 1H and 10 ohm resistance are connected to a battery of emf 50 V ,The circuit is switched on at t=0.Let dU/dt be the rate at which energy is stored in the inducter,and P₀is the power output of battery at time t.(ln 2=.693) Then-----
a.P₀=dU/dt ,at t=0
b.t=0,P₀=250
c.t=.0693,P₀=2dU/dt
d.dU/dt is max at t=.0693